1.(x-1)(x+4) 2.(-0.3 x 10^2) x (-0.4 x 10^5) 3.(3a-2b)(-2b-3a)4.(-x+y)(x+y)因式分解5.(m+n-1）（m-n-1)=

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1.(x-1)(x+4) 2.(-0.3 x 10^2) x (-0.4 x 10^5) 3.(3a-2b)(-2b-3a)4.(-x+y)(x+y)因式分解5.(m+n-1）（m-n-1)=
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1.(x-1)(x+4) 2.(-0.3 x 10^2) x (-0.4 x 10^5) 3.(3a-2b)(-2b-3a)4.(-x+y)(x+y)因式分解5.(m+n-1）（m-n-1)=
1.(x-1)(x+4) 2.(-0.3 x 10^2) x (-0.4 x 10^5) 3.(3a-2b)(-2b-3a)4.(-x+y)(x+y)因式分解
5.(m+n-1）（m-n-1)=

1.(x-1)(x+4) 2.(-0.3 x 10^2) x (-0.4 x 10^5) 3.(3a-2b)(-2b-3a)4.(-x+y)(x+y)因式分解5.(m+n-1）（m-n-1)=
1.无法再分
2.1.2x10^6
3.4b^2-9a^2
4.y^2-x^2
5.（m-1）^2-n^2