单项选择题

The value of y will decrease as the value of x increases in which of the following equations（）

A. y=x
B. y=x-2
C. 2-y=3-x
D. 2x-y=4
E. x+2y=1

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单项选择题
The expression (x+4)(2x-3) is equivalent to which of the following（） Ⅰ、2x(x+4)-3(x+4) Ⅱ、(x-4)(2x+3) Ⅲ、 2x2-12

A. Ⅰ only
B. Ⅱ only
C. Ⅲ only
D. Ⅱ and Ⅲ only
E. Ⅰ，Ⅱ，and Ⅲ
单项选择题
If x is pcrcent more than y，then y is what percent less than x（）

A. 9%
B. 10%
C. 11%
D. 12%
E. 15%
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