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a-b=3,ad=-1.(4a-5b-ab)-(2a-3b+5ab)的值
人气:247 ℃ 时间:2019-12-05 10:47:39
解答
(4a-5b-ab)-(2a-3b+5ab)
= 4a - 5b - ab - 2a + 3b - 5ab
= 2a - 2b - 6ab
=2(a-b) - 6ab
= 6 + 6
=12
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