1:若a与2b互为负倒数,-c与d/2互为相反数,m与n互为相反数,求2ab-2c+d+m÷n.
人气:444 ℃ 时间:2019-10-10 05:59:46
解答
a与2b互为负倒数,a*2b=-1
-c与d/2互为相反数,-c+d/2=0,-2c+d=0
m与n互为相反数,m+n=0
2ab-2c+d+m÷n
= -1 +0 + (-1)
= -2
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