计算:(a-2b+3c)(a+2b-3c)

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计算:(a-2b+3c)(a+2b-3c)计算:(a-2b+3c)(a+2b-3c)计算:(a-2b+3c)(a+2b-3c)=[a-(2b-3c)][a+(2b-3c)]=a²-(2b-3

计算:(a-2b+3c)(a+2b-3c)
计算:(a-2b+3c)(a+2b-3c)

计算:(a-2b+3c)(a+2b-3c)
=[a-(2b-3c)][a+(2b-3c)]
=a²-(2b-3c)²
=a²-4b²+12bc-9c²

(a-2b+3c)(a+2b-3c)
=(a-(2b-3c))(a+(2b-3c))
=a^2-(2b-3c)^2
=a^2-4b^2+12bc-9c^2

(a-2b-3c)^2 =(a-2b)^2-6c(a-2b)+9c^2 =(a-2b)^2-6ac+12bc+9c^2 =a^2-4ab+b^2-6ac+12bc+9c^2 正解