
已知a-b=5,ab=-1,求(2a+3b-2ab)-(a+4b+ab)-(3ab-2a+2b)-(3ab-2a+2b)的值
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(2a+3b-2ab)-(a+4b+ab)-(3ab-2a+2b)-(3ab-2a+2b)
=2a+3b-2ab-a-4b-ab-3ab+2a-2b-3ab+2a-2b
=5a-5b-9ab
=5(a-b)-9ab
=5×5+9
=25+9
=34
=2a+3b-2ab-a-4b-ab-3ab+2a-2b-3ab+2a-2b
=5a-5b-9ab
=5(a-b)-9ab
=5×5+9
=25+9
=34
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