单项选择题

（）

A. if the quantity in Column A is greater;
B. if the quantity in Column B is greater;
C. if the two quantities are equal;
D.if the relationship cannot be determined from the information given.

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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

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