已知a-b=3,a×b=-3,求代数式(2a+3b-2ab)-(a+4b+ab)-(3ab+2b-2a)的值,

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/18 10:23:08
已知a-b=3,a×b=-3,求代数式(2a+3b-2ab)-(a+4b+ab)-(3ab+2b-2a)的值,
x1 04MżPH 89 `7b+E7%x./x& =z=NRw$A HR7cQPɐe_ ^Z]|GS9t6Y8ݏl@e֫)i?8

已知a-b=3,a×b=-3,求代数式(2a+3b-2ab)-(a+4b+ab)-(3ab+2b-2a)的值,
已知a-b=3,a×b=-3,求代数式(2a+3b-2ab)-(a+4b+ab)-(3ab+2b-2a)的值,

已知a-b=3,a×b=-3,求代数式(2a+3b-2ab)-(a+4b+ab)-(3ab+2b-2a)的值,
(2a+3b-2ab)-(a+4b+ab)-(3ab+2b-2a)
=2a+3b-2ab-a-4b-ab-3ab-2b+2a
=3a-3b-6ab
=3(a-b)-6ab
=9+18
=27

(2a+3b-2ab)-(a+4b+ab)-(3ab+2b-2a)
=2a+3b-2ab-a-4b-ab-3ab-2b+2a
=2a+2a-a+3b-4b-2b-2ab-ab-3ab
=3a-3b-6ab
=3(a-b)-6ab
=3*3-6*(-3)
=9+18
=27