若|m-3|+|n+2|=0,则m+2n的值为A.-4B.-1C.0D.4
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若|m-3|+|n+2|=0,则m+2n的值为A.-4B.-1C.0D.4若|m-3|+|n+2|=0,则m+2n的值为A.-4B.-1C.0D.4若|m-3|+|n+2|=0,则m+2n的值为A.-
若|m-3|+|n+2|=0,则m+2n的值为A.-4B.-1C.0D.4
若|m-3|+|n+2|=0,则m+2n的值为
A.-4
B.-1
C.0
D.4
若|m-3|+|n+2|=0,则m+2n的值为A.-4B.-1C.0D.4
|m-3|+|n+2|=0,则m=3,n=-2
m+2n=3-4=-1
所以选B
【参考答案】
m-3=n+2=0
得到 m=3, n=-2
于是:m+2n=3-4=-1
答案B
绝对值非负,两个非负数和为0,只能是两者都为0,即|m-3|=|n+2|=0,所以m=3,n=-2,m+2n=-1.选B.
/m-3/+/n+2/=0 m=3 n=-2 B
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