(a+b+c)²-(a-b-c)² 因式分解

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(a+b+c)²-(a-b-c)² 因式分解
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(a+b+c)²-(a-b-c)² 因式分解
(a+b+c)²-(a-b-c)² 因式分解

(a+b+c)²-(a-b-c)² 因式分解
=(a+b+c+a-b-c)(a+b+c-a+b+c)
=4a(b+c)

(a+b+c)²-(a-b-c)²
=[(a+b+c)+(a-b-c)]*[(a+b+c)-(a-b-c)]
=(2a)*(2b+2c)
=4a(b+c)

(a+b+c)²-(a-b-c)²
=[(a+b+c)+(a-b-c)]*[(a+b+c)-(a-b-c)]
=(2a)*(2b+2c)
=4a(b+c)

=(a+b+c+a-b-c)(a+b+c-a+b+c)
=2a(2b+2c)
=4a(b+c)