(a+b+b)²-(a-b-c)² 过程和答案!
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(a+b+b)²-(a-b-c)² 过程和答案!
(a+b+b)²-(a-b-c)² 过程和答案!
(a+b+b)²-(a-b-c)² 过程和答案!
我想你应该打错了.
(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)