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[ { "content": "## Task B-1.3.\n\nA ship traveling along a river has covered $24 \\mathrm{~km}$ upstream and $28 \\mathrm{~km}$ downstream. For this journey, it took half an hour less than for traveling $30 \\mathrm{~km}$ upstream and $21 \\mathrm{~km}$ downstream, or half an hour more than for traveling $15 \\ma...
3,117
open-r1/OpenR1-Math-220k
[ { "content": "3. (6 points) A construction company was building a tunnel. When $\\frac{1}{3}$ of the tunnel was completed at the original speed, they started using new equipment, which increased the construction speed by $20 \\%$ and reduced the working hours to $80 \\%$ of the original. As a result, it took a ...
2,708
open-r1/OpenR1-Math-220k
[ { "content": "4. Given the three sides of an obtuse triangle are 3, $4, x$, then the range of values for $x$ is ( ).\n(A) $1<x<7$.\n(B) $5 \\ll x<7$.\n(C) $1<x<\\sqrt{7}$.\n(D) $5<x<7$ or $1<x<\\sqrt{7}$.", "role": "user" }, { "content": "<think>\nOkay, so I have this problem here where I need to fi...
2,101
open-r1/OpenR1-Math-220k
[ { "content": "1. Solve the equation: $\\frac{8 x+13}{3}=\\frac{19-12 x}{2}-\\left(16 x-\\frac{7-4 x}{6}\\right)$.", "role": "user" }, { "content": "<think>\nOkay, so I need to solve this equation: (8x + 13)/3 = (19 - 12x)/2 - (16x - (7 - 4x)/6). Hmm, that looks a bit complicated with all the fractio...
1,749
open-r1/OpenR1-Math-220k
[ { "content": "Task B-4.2. Let $n$ be the number obtained by writing 2013 zeros between every two digits of the number 14641. Determine all solutions of the equation $x^{4}=n$ in the set $\\mathbb{C}$.", "role": "user" }, { "content": "<think>\nOkay, let's see. I need to find all complex solutions to...
3,739
open-r1/OpenR1-Math-220k
[ { "content": "## Problem Statement\n\nCalculate the definite integral:\n\n$$\n\\int_{0}^{3 / 2} \\frac{x^{2} \\cdot d x}{\\sqrt{9-x^{2}}}\n$$", "role": "user" }, { "content": "<think>\nOkay, so I need to calculate the definite integral of x squared over the square root of (9 minus x squared) from 0 ...
3,425
open-r1/OpenR1-Math-220k
[ { "content": "Example 1 (Question from the 13th \"Hope Cup\" Invitational Competition) The real roots of the equations $x^{5}+x+1=0$ and $x+\\sqrt[5]{x}+1=0$ are $\\alpha, \\beta$ respectively, then $\\alpha+\\beta$ equals ( ).\nA. -1\nB. $-\\frac{1}{2}$\nC. $\\frac{1}{2}$\nD. 1", "role": "user" }, { ...
3,460
open-r1/OpenR1-Math-220k
[ { "content": "Example 5 Given that $x_{1}, x_{2}, \\cdots, x_{10}$ are all positive integers, and $x_{1}+x_{2}+\\cdots+x_{10}=2005$, find the maximum and minimum values of $x_{1}^{2}+x_{2}^{2}+\\cdots+x_{10}^{2}$.", "role": "user" }, { "content": "<think>\nOkay, let's see. I need to find the maximum...
2,700
open-r1/OpenR1-Math-220k
[ { "content": "1. If the set\n$$\nA=\\{1,2, \\cdots, 10\\}, B=\\{1,2,3,4\\},\n$$\n$C$ is a subset of $A$, and $C \\cap B \\neq \\varnothing$, then the number of such subsets $C$ is $(\\quad)$.\n(A) 256\n(B) 959\n(C) 960\n(D) 961", "role": "user" }, { "content": "<think>\nOkay, so I need to figure out...
2,364
open-r1/OpenR1-Math-220k
[ { "content": "Augusto has a wire that is $10 \\mathrm{~m}$ long. He makes a cut at a point on the wire, obtaining two pieces. One piece has a length of $x$ and the other has a length of $10-x$ as shown in the figure below:\n\n![](https://cdn.mathpix.com/cropped/2024_05_01_d02c2755ad3373bde08ag-05.jpg?height=645...
3,165
open-r1/OpenR1-Math-220k
[ { "content": "29. Choose any three numbers from $a, b, c, d, e$ and find their sum, exactly obtaining the ten different numbers $7,11,13,14,19,21,22,25,26,28$. Then $a+b+c+d+e=$ ( i). MATHEMATICE YoUTH CLUE A. 25\nB. 31\nC. 37\nD. 43", "role": "user" }, { "content": "<think>\nOkay, so I need to figu...
3,220
open-r1/OpenR1-Math-220k
[ { "content": "Problem 3. In the school, there are 50 teachers, of whom 29 drink coffee, 28 drink tea, and 16 do not drink either coffee or tea. How many teachers drink only coffee, and how many drink only tea?", "role": "user" }, { "content": "<think>\nOkay, let's see. There's a problem about teache...
1,327
open-r1/OpenR1-Math-220k
[ { "content": "12.180. A side of the triangle is equal to 15, the sum of the other two sides is 27. Find the cosine of the angle opposite the given side, if the radius of the inscribed circle in the triangle is 4.", "role": "user" }, { "content": "<think>\nOkay, let's see. The problem says that one s...
2,612
open-r1/OpenR1-Math-220k
[ { "content": "## Problem Statement\n\nCalculate the limit of the numerical sequence:\n\n$\\lim _{n \\rightarrow \\infty} \\frac{(n+1)^{4}-(n-1)^{4}}{(n+1)^{3}+(n-1)^{3}}$", "role": "user" }, { "content": "<think>\nOkay, so I need to find the limit as n approaches infinity of the expression [(n+1)^4 ...
3,640
open-r1/OpenR1-Math-220k
[ { "content": "\\section*{Problem 5 - 071225}\n\nAll ordered pairs of real numbers \\((x, y)\\) are to be determined for which the system of equations\n\n\\[\n\\begin{aligned}\nx \\cdot\\left(a x^{2}+b y^{2}-a\\right) & =0 \\\\\ny \\cdot\\left(a x^{2}+b y^{2}-b\\right) & =0\n\\end{aligned}\n\\]\n\nis satisfied. ...
3,647
open-r1/OpenR1-Math-220k
[ { "content": "40. The sum of three consecutive odd numbers is equal to the fourth power of a single-digit number. Find all such triples of numbers.", "role": "user" }, { "content": "<think>\nOkay, let's see. The problem says that the sum of three consecutive odd numbers is equal to the fourth power ...
2,732
open-r1/OpenR1-Math-220k
[ { "content": "Two is $10 \\%$ of $x$ and $20 \\%$ of $y$. What is $x - y$?\n$(\\mathrm {A}) \\ 1 \\qquad (\\mathrm {B}) \\ 2 \\qquad (\\mathrm {C})\\ 5 \\qquad (\\mathrm {D}) \\ 10 \\qquad (\\mathrm {E})\\ 20$", "role": "user" }, { "content": "<think>\nOkay, let's see here. The problem says that two...
1,217
open-r1/OpenR1-Math-220k
[ { "content": "1. (6 points) Today is January 31, 2015, welcome to the 2015 \"Spring Cup\" Final. The calculation result of the expression $\\frac{\\frac{2015}{1}+\\frac{2015}{0.31}}{1+0.31}$ is", "role": "user" }, { "content": "<think>\nOkay, so I need to calculate this expression: (2015/1 + 2015/0....
2,430
open-r1/OpenR1-Math-220k
[ { "content": "Consider a regular hexagon with an incircle. What is the ratio of the area inside the incircle to the area of the hexagon?\n", "role": "user" }, { "content": "<think>\nOkay, so I need to find the ratio of the area inside the incircle of a regular hexagon to the area of the hexagon itse...
2,554
open-r1/OpenR1-Math-220k
[ { "content": "30. Find the remainder when the 2018-digit number $\\underbrace{\\overline{55 \\cdots}}_{2018 \\text { 555 }}$ is divided by 13.", "role": "user" }, { "content": "<think>\nOkay, so I need to find the remainder when this huge 2018-digit number made up entirely of 5s is divided by 13. Hm...
2,879
open-r1/OpenR1-Math-220k
[ { "content": "1. A line $l$ intersects a hyperbola $c$, then the maximum number of intersection points is ( ).\nA. 1\nB. 2\nC. 3\nD. 4", "role": "user" }, { "content": "<think>\nOkay, so I need to figure out the maximum number of points where a line can intersect a hyperbola. The options are 1, 2, 3...
2,663
open-r1/OpenR1-Math-220k
[ { "content": "1. Let the universal set be the set of real numbers. If $A=\\{x \\mid \\sqrt{x-2} \\leqslant 0\\}, B=\\left\\{x \\mid 10^{x^{2}-2}=10^{x}\\right\\}$, then $A \\cap \\bar{B}$ is\nA. $\\{2\\}$\nB. $\\{-1\\}$\nC. $\\{x \\mid x \\leqslant 2\\}$\nD. $\\varnothing$", "role": "user" }, { "con...
1,805
open-r1/OpenR1-Math-220k
[ { "content": "7.242. $\\left(16 \\cdot 5^{2 x-1}-2 \\cdot 5^{x-1}-0.048\\right) \\lg \\left(x^{3}+2 x+1\\right)=0$.", "role": "user" }, { "content": "<think>\nOkay, let's see. I need to solve the equation: \n\n\\[16 \\cdot 5^{2x-1} - 2 \\cdot 5^{x-1} - 0.048 = 0\\]\nmultiplied by \n\\[\\lg(x^3 + 2x ...
3,499
open-r1/OpenR1-Math-220k
[ { "content": "In order for Mateen to walk a kilometer (1000m) in his rectangular backyard, he must walk the length 25 times or walk its perimeter 10 times. What is the area of Mateen's backyard in square meters?\n$\\text{(A)}\\ 40 \\qquad \\text{(B)}\\ 200 \\qquad \\text{(C)}\\ 400 \\qquad \\text{(D)}\\ 500 \\q...
1,849
open-r1/OpenR1-Math-220k
[ { "content": "The knights in a certain kingdom come in two colors. $\\frac{2}{7}$ of them are red, and the rest are blue. Furthermore, $\\frac{1}{6}$ of the knights are magical, and the fraction of red knights who are magical is $2$ times the fraction of blue knights who are magical. What fraction of red knight...
1,711
open-r1/OpenR1-Math-220k
[ { "content": "A father wants to divide his property among his children: first, he gives 1000 yuan and one-tenth of the remaining property to the eldest child, then 2000 yuan and one-tenth of the remaining property to the second child, then 3000 yuan and one-tenth of the remaining property to the third child, an...
3,805
open-r1/OpenR1-Math-220k
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