全要过程(a+1)(a-1)(a的2方-1)=过程

问题描述:

全要过程(a+1)(a-1)(a的2方-1)=过程
(x-2)(x+2)(x的2方+4)=过程
(x+3y)的2方+2(x-y)(x+y)+(x-3y)的2方
[(a-1/2)的2方+(a+1/2)的2方](2a的2方-1/2)
(a+2b-3)(a+2b+3)=
(x的2方+x+3)(x的2方-x-3)
(x+2y+3)的2方-(x-2y+3)(x-2y-3)=

(a+1)(a-1)(a^2-1)=(a^2-1)^2=a^4-2a^2+1(x-2)(x+2)(x^2+4)=(x^2-4)(x^2+4)=x^2-16(x+3y)^2+2(x-y)(x+y)+(x-3y)^2=x^2+6xy+9y^2+2x^2-2y^2+x^2-6xy+9y^2=4x^2-16y^2[(a-1/2)^2+(a+1/2)^2](2a^2-1/2)=(a^2-a...