Toán Lớp 8: Rút gọn:
(ab+ac)(a² – c²) + (bc + ba)(c²-a²)
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Toán Lớp 8: Rút gọn:
(ab+ac)(a² – c²) + (bc + ba)(c²-a²)
Comments ( 2 )
=(ab+ac)(a^2-c^2)-(ab+bc)(a^2-c^2)
=(a^2-c^2)(ab+ac-ab-bc)
=(a^2-c^2)(ac-bc)
=(a-c)(a+c)c(a-b)