单选题 If ax + x2 = y2 -ay, what is a in terms of x and y?
y -x
x-y
x +y
(x2 + y2)/(x + y)
(x2 + y2)/(x - y)
单选题 A container holds 8 pints of a solution which is 25% acid. If 2 quarts of pure acid are added to the container, what percent of the resulting mixture is acid? (1 quart=2 pints)
50
20
40
45
35
单选题 If A is 125% of B, then B is what percent of A?
60%
75%
80%
88%
90%
单选题 If 5a+3b = 35 and a/b = 2/5, what is the value of a?
14/5
7/2
5
7
9
单选题 When f(x) is divided by 2x + 1, the quotient is x2-x+ 4 and the remainder is 6. What is f(x)?
2x3-x2 + 9x+ 6
2x3-2x2 + 8x + 6
x2-x + 10
2x3-x2 + 7x + 4
2x3-x2 + 7x + 10
单选题 (4a+a-3)(4b-2b-b) = ______.
2a-b
2ab-2b
5ab – b
5ab-3b
3ab
单选题 If a/b = 6/7 and a/c = 2/5, what is the value of 3b + c in terms of a?
12a
9a
8a
6a
4a
单选题 If , then = ______.
2x+1
单选题 If (x-1) 2-(x-1) = 0, then, ______.
x = 0 or x = 2
x = 0 or x = 1
x =-1 or x = 2
x = 1 or x = 2
x = 0 or x =-1