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化简:-5a-(4a+3b)+(a-2b) 3(a方-ab)-5(ab+2a方-1)
人气:300 ℃ 时间:2019-10-10 04:09:36
解答
-5a-(4a+3b)+(a-2b)
=-5a-4a-3b+a-2b
=(-5-4+1)a-(3+2)b
=-8a-5b
3(a^2-ab)-5(ab+2a^-1)
=3a^2-3ab-5ab-10a^2+5
=(3-10)a^2-(3+5)ab+5
=-7a^2-8ab+5
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