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1350
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题目： If xy = 7 and x - y = 5, then $$x^{2} + y^{2} =$$
1298
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题目： $${4^{6}-4^{5}}\over{3}$$=
1299
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题目： Hal has 4 girl friends and 5 boy friends. In how many different ways can Hal invite 2 girls and 2 boys to his birthday party?
1300
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题目： A, B, and C are consecutive odd integers such that A < B < C.If A + B + C = 81, then A + C =
1302
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题目： If x and y are both positive and $$\sqrt{x^{2}+y^{2}} = 3x - y, then \frac{x}{y} =$$
1303
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题目： Line k is in the rectangular coordinate system. If the x-intercept of k is -2, and the y-intercept is 3, which of the following is an equation of line k?
1304
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题目： If$${(\frac{1}{x}+x)}^{2}=16$$,then $${{1}\over{x^{2}}}+x^{2}=$$
1305
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题目： If 3 apples and 4 bananas costs $1.37, and 5 apples and 7 bananas costs $2.36, what is the total cost of 1 apple and 1 banana?
1306
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题目： When positive integer x is divided by 11, the quotient is y and the remainder is 4. When 2x is divided by 8, the quotient is 3y and the remainder is 2. What is the value of 13y – x ?
1307
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题目： A is the center of the circle, and the length of AB is$$4\sqrt{2}$$ . The blue shaded region is a square. What is the area of the shaded region?
1308
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题目： If ak - b = c - dk, then k =
1309
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题目： Dimitri weighs x pounds more than Allen weighs. Together, Allen and Dimitri weigh a total of y pounds. Which of the following represents Allen's weight?
1310
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题目： If $$10^{a} x 10^{b} x 10^{c} = 1,000,000$$, and a, b, and c are different positive integers, then $$10^{a} + 10^{b} + 10^{c} =$$
1311
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题目： If the average (arithmetic mean) of five consecutive negative integers is 2k – 1, what is the difference between the greatest and least of the five integers?
1312
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题目： If 3x < 2y < 0, which of the following must be the greatest?
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2019.10.14
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