(4a-5ab+b)-(2a-3ab+3b)的值,其中a-b=5,ab=2
问题描述:
(4a-5ab+b)-(2a-3ab+3b)的值,其中a-b=5,ab=2
答
(4a-5ab+b)-(2a-3ab+3b)
=4a-5ab+b-2a+3ab-3b
=2a-2ab-2b
=2(a-b-ab)
=2(5-2)
=2*3
=6