若a、b互为相反数,c、d互为倒数,m的绝对值等于2,计算m﹣(a+b)2﹣(cd)3的值. 答案:解:∵a、b互为相反数,c、d互为倒数,m的绝对值等于2,∴a+b=0,cd=1,m=±2.当m=2时,原式=2﹣02﹣13=2﹣1=1; 当m=﹣2时,原式=﹣2﹣02﹣13=﹣3. 综上所述:m﹣(a+b)2﹣(cd)3的值为1或﹣3.He can't be ill, __ he __ come.
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A. or , couldn抰 B. otherwise , could have
C. or , wouldn抰 have D. otherwise , should have