a-1的绝对值+(b-2)(b-2)=0.A=3a*a-6ab+b*b.B=-a*a-5求A-B
问题描述:
a-1的绝对值+(b-2)(b-2)=0.A=3a*a-6ab+b*b.B=-a*a-5求A-B
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答
a-1的绝对值+(b-2)(b-2)=0
a-1=0,b-2=0
a=1,b=2
A-B
=(3a*a-6ab+b*b)-(-a*a-5)
=4a*a-6ab+b*b+5
=4-12+4+5
=1