去括号,得(2a+3b-2ab)-(a+4b+ab)-(3ab+2b-2a)
=2a+3b-2ab-a-4b-ab-3ab-2b+2a
合并同类项,得3a-3b-6ab
把a-b=5,ab=1代入,得
原式=3a-3b-6ab
=3×5-6
=15-6
=9
去括号,得(2a+3b-2ab)-(a+4b+ab)-(3ab+2b-2a)
=2a+3b-2ab-a-4b-ab-3ab-2b+2a
合并同类项,得3a-3b-6ab
把a-b=5,ab=1代入,得
原式=3a-3b-6ab
=3×5-6
=15-6
=9