若a、b互为相反数,c、d互为倒数,则2a+2b-3cd+a/b=?
人气：497 ℃ 时间：2020-04-19 05:57:18
解答
b=-a
所以a/b=-1且a+b=0
cd=1
所以原式=2(a+b)-3×1+(-1)
=0-3-1
=-4
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