(4a^b-3ab)+(-5a^2b+2ab)

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(4a^b-3ab)+(-5a^2b+2ab)(4a^b-3ab)+(-5a^2b+2ab)(4a^b-3ab)+(-5a^2b+2ab)你的题应为(4a^2b-3ab)+(-5a^2b+2ab)吧?

(4a^b-3ab)+(-5a^2b+2ab)
(4a^b-3ab)+(-5a^2b+2ab)

(4a^b-3ab)+(-5a^2b+2ab)
你的题应为(4a^2b-3ab)+(-5a^2b+2ab)吧?
那么
(4a^2b-3ab)+(-5a^2b+2ab)
=4a^2b-3ab-5a^2b+2ab
=-a^2b-ab
=-ab(a+1)