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

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

已知数a-b=2,ab=-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
=3×2-6×(-3)
=6+18
=24

(2a+3b-2ab)-(a+4b+ab)-(3ab+2b-2a)
=2a+3b-2ab-a-4b-ab-3ab-2b+2a
=3a-3b-5ab
=3(a-b)-5ab
=3×2-5×(-3)
=21

23

(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
=3*2-6*(-3)
=24

(2a+3b-2ab)-(a+4b+ab)-(3ab+2b-2a)
=2a+3b-2ab-a-4b-ab-3ab-2b+2a
=3a-3b-5ab
=3(a-b)-5ab
=3×2-5×(-3)
=21 懂了吗