(a-b+c)(a-b-c) 怎么做····急 ·······

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(a-b+c)(a-b-c)怎么做····急·······(a-b+c)(a-b-c)怎么做····急·······(a-b+c)(a-b-c)怎么做····急·······原式=[(a-b)+c][

(a-b+c)(a-b-c) 怎么做····急 ·······
(a-b+c)(a-b-c) 怎么做····急 ·······

(a-b+c)(a-b-c) 怎么做····急 ·······
原式=[(a-b)+c][(a-b)-c]
=(a-b)²-c²
=a²-2ab+b²-c²

(a-b+c)(a-b-c)
=[(a-b)+c]*[(a-b)-c]
=(a-b)²-c²
=a²-2ab+b²-c²

(a-b)平方减c平方

=a^2-ab-ac-ab+b^2+bc+ac-bc-c^2
=a^2-2ab+b^2-c^2

(a-b+c)(a-b-c)
=[(a-b)+c][(a-b)-c]
=(a-b)²-c²
=a²-2ab+b²-c²