1.x(x-3)-2(x-3)=(x-2)(x-3)
2.(2x-y)(2x-y)-(2x-y)=(2x-y)(2x-y-1)
3.(x+y)-(3x+3y)(x+y)=(1-3x-3y)(x+y)
4.(m+n+n)(m+n-n)=(m+2n)m
5.(3x-y+x+3y)(3x-y-x-3y)=(4x+2y)(2x-4y)
有不懂的可以问我,
1.x(x-3)-2(x-3)=(x-2)(x-3)
2.(2x-y)(2x-y)-(2x-y)=(2x-y)(2x-y-1)
3.(x+y)-(3x+3y)(x+y)=(1-3x-3y)(x+y)
4.(m+n+n)(m+n-n)=(m+2n)m
5.(3x-y+x+3y)(3x-y-x-3y)=(4x+2y)(2x-4y)
有不懂的可以问我,