a,b互为相反数,c,d互为倒数,x的绝对值是1,求x-(a+b+cd)x-cd得值.
人气:344 ℃ 时间:2020-02-09 09:41:18
解答
a,b互为相反数,a+b=0
c,d互为倒数,cd=1
x的绝对值是1,x=1或-1
x-(a+b+cd)x-cd=x-x-1=-1
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