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3a^2b-[2ab^2-2(ab-3a^2b/2)]+2ab
=3a^2b-2ab^2+2(ab-3a^2b/2)+2ab
=3a^2b-2ab^2+2ab-3a^2b+2ab
=-2ab^2+4ab
=2ab(2-b)
因:|a+3b+1|+(2a-4)^2=0,
故:a+3b+1=0,且2a-4=0.
解得:a=2,b=-1;
2ab(2-b)=2*2*(-1)(2-(-1))=-12
=3a^2b-2ab^2+2(ab-3a^2b/2)+2ab
=3a^2b-2ab^2+2ab-3a^2b+2ab
=-2ab^2+4ab
=2ab(2-b)
因:|a+3b+1|+(2a-4)^2=0,
故:a+3b+1=0,且2a-4=0.
解得:a=2,b=-1;
2ab(2-b)=2*2*(-1)(2-(-1))=-12
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2014-08-15
展开全部
3a^2b-[2ab^2-2(ab-3a^2b/2)]+2ab
=3a^2b-2ab^2+2(ab-3a^2b/2)+2ab
=3a^2b-2ab^2+2ab-3a^2b+2ab
=-2ab^2+4ab
=2ab(2-b)
∵ |a+3b+1|+(2a-4)^2=0,
∴ a+3b+1=0,且2a-4=0.
解得:a=2,b=-1;
2ab(2-b)=2*2*(-1)(2-(-1))=-12
=3a^2b-2ab^2+2(ab-3a^2b/2)+2ab
=3a^2b-2ab^2+2ab-3a^2b+2ab
=-2ab^2+4ab
=2ab(2-b)
∵ |a+3b+1|+(2a-4)^2=0,
∴ a+3b+1=0,且2a-4=0.
解得:a=2,b=-1;
2ab(2-b)=2*2*(-1)(2-(-1))=-12
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评论
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