(a-b+c)(a+b-c)=?(2a-b)^2-(2a+b)^2=?(-x-y)(y-x)+(-x-y)(x+y)=?
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(a-b+c)(a+b-c)=?(2a-b)^2-(2a+b)^2=?(-x-y)(y-x)+(-x-y)(x+y)=?若a^2+b
(a-b+c)(a+b-c)=?(2a-b)^2-(2a+b)^2=?(-x-y)(y-x)+(-x-y)(x+y)=?若a^2+b^2.a-b=1.2,求a,b的值
(a-b+c)(a+b-c)=?(2a-b)^2-(2a+b)^2=?(-x-y)(y-x)+(-x-y)(x+y)=?若a^2+b^2.a-b=1.2,求a,b的值
![(a-b+c)(a+b-c)=?(2a-b)^2-(2a+b)^2=?(-x-y)(y-x)+(-x-y)(x+y)=?](/uploads/image/z/19948524-60-4.jpg?t=%EF%BC%88a-b%2Bc%29%28a%2Bb-c%29%3D%3F%282a-b%29%5E2-%282a%2Bb%29%5E2%3D%3F%28-x-y%29%28y-x%29%2B%28-x-y%29%28x%2By%29%3D%3F)
(1)(a-b+c)(a+b-c)
=[a-(b-c)][a+(b-c)]
=a^2-(b-c)^2
=a^2-b^2-c^2+2bc
(2)(2a-b)^2-(2a+b)^2
=(2a-b+2a+b)(2a-b-2a-b)
=4a(-2b)
=-8ab
(3)(-x-y)(y-x)+(-x-y)(x+y)
=(x+y)(x-y)-(x+y)^2
=x^2-y^2-x^2-2xy-y^2
=-2xy-2y^2
(4)题目写漏了?若a^2+b^2?.a^2+b^2=什么?
=[a-(b-c)][a+(b-c)]
=a^2-(b-c)^2
=a^2-b^2-c^2+2bc
(2)(2a-b)^2-(2a+b)^2
=(2a-b+2a+b)(2a-b-2a-b)
=4a(-2b)
=-8ab
(3)(-x-y)(y-x)+(-x-y)(x+y)
=(x+y)(x-y)-(x+y)^2
=x^2-y^2-x^2-2xy-y^2
=-2xy-2y^2
(4)题目写漏了?若a^2+b^2?.a^2+b^2=什么?
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