问题 填空题

若a+b=3,ab=-2,则(4a-5b-3ab)-(3a-6b+ab)=______.

答案

∵a+b=3,ab=-2,

(4a-5b-3ab)-(3a-6b+ab)

=4a-5b-3ab-3a+6b-ab

=a+b-4ab

=3-4×(-2)

=11,

故答案为:11.

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