www.70mao.com:a-1的相反数是3,则a=( )
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a-1的相反数是3
即-(a-1)=3
a-1=-3
a=-2
-(a-1)=3,a-1=-3,a=-3+1,a=-2
-(a-1)=3 a-1=-3 a=-2
-2
-2
-2
a-1的相反数是3
即-(a-1)=3
a-1=-3
a=-2
-(a-1)=3,a-1=-3,a=-3+1,a=-2
-(a-1)=3 a-1=-3 a=-2
-2
-2
-2