1.(x^2-3)^2+2(x^2-3)(x-3)+(x-3)^2
2.(x+1)(x+3)(x+5)(x+7)+15
3.x^2+y^2+4x+2y+3
4.(a^2+a+1)^2+2(a^2+a+1)(a^2+a-1)+(a^2+a-1)^2
5.(x^2+4)^2-16x^2
6.(a+b+c)^2-(a-b-c)^2
7.25(x-y)^2-16(x+y)^2
8.x^4-81x^2y^2
9.x^2(x-y)+y^2(y-x)
10.(a-b)(x-y)+(b-a)(x+y)
(乘法)
11.2(2m-1)^2-3(m+1)(m-1)-2(m-1)^2
12.(2x+y+3t)(2x-y-3t)
13.(3a+1)^2(3a-1)^2
14.(2x-y)(2x+y)-(3x-y)(4x-y)
15.(-4x+2y)(-2y-4x)-(2x+3y)(8x-9y)
16.(2a+b-c)^2
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