若A,B互为倒数,c,d互为相反数,求2c+2d-3ab
人气：449 ℃ 时间：2019-10-19 05:35:09
解答
A,B互为倒数,则A*B=1
C,D互为相反数,则C+D=0
2c+2d-3ab
=2(c+d)-3a*b
=2*0-3*1
=0-3
=-3
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