已知|a+2|+(b+3)^2=0,求3a^2b-【2a^2b-(2ab-a^2)-4a^2】-ab的值

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/25 18:27:59
已知|a+2|+(b+3)^2=0,求3a^2b-【2a^2b-(2ab-a^2)-4a^2】-ab的值已知|a+2|+(b+3)^2=0,求3a^2b-【2a^2b-(2ab-a^2)-4a^2】-

已知|a+2|+(b+3)^2=0,求3a^2b-【2a^2b-(2ab-a^2)-4a^2】-ab的值
已知|a+2|+(b+3)^2=0,求3a^2b-【2a^2b-(2ab-a^2)-4a^2】-ab的值

已知|a+2|+(b+3)^2=0,求3a^2b-【2a^2b-(2ab-a^2)-4a^2】-ab的值
绝对值和平方大于等于0,相加等于0,若有一个大于0,则另一个小于0,不成立.
所以两个都等于0
所以a+2=0,b+3=0
a=-2,b=-3
所以原式=3a²b-2a²b+2ab-a²+4a²-ab
=a²b+ab-3a²
=-12+6-27
=-39

所以两个都等于0
所以a+2=0,b+3=0
a=-2,b=-3
所以原式=3a²b-2a²b+2ab-a²+4a²-ab
=a²b+ab-3a²
=-12+6-27

~~%%%%%%%%_,_,
~~%%%%%%%%%-"/./
~~%%%%%%%-' / `.
~~%%%%%%%%' . ,__;
~~%%%%%%%%' : \O\
~~%%%%...

全部展开

~~%%%%%%%%_,_,
~~%%%%%%%%%-"/./
~~%%%%%%%-' / `.
~~%%%%%%%%' . ,__;
~~%%%%%%%%' : \O\
~~%%%%%%%%' : `.
~~%%%%%%%%' `. _, '
~~%%%%%%%%' .'`-._ `.
~~%%%%%%%%%' : `-. (,;
~~%%%%%%%%' : `._\_.'
~~%% %%' ;

收起