题目

I'd ______ the operation unless it is absolutely necessary.      A. rather not have     B. rather not to have   C. not rather had       D. rather not having 答案:A12.计算:(1)($\frac{1}{2}$)0-($\frac{1}{3}$)-3(2)(-a2)3•(-a3)2;(3)x(2x-5)+3x(x+2);(4)(x-1)(2x+1)-2(x-5)(x+2)
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