提公因式法:1.m(x-y)-x+y; 2.(x-3)^2+(3x-9)

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提公因式法:1.m(x-y)-x+y; 2.(x-3)^2+(3x-9)
提公因式法:1.m(x-y)-x+y; 2.(x-3)^2+(3x-9)

提公因式法:1.m(x-y)-x+y; 2.(x-3)^2+(3x-9)
1.m(x-y)-x+y
=m(x-y)-(x-y)
=(x-y)(m-1)
2.(x-3)^2+(3x-9)
=(x-3)^2+3(x-3)
=(x-3)(x-3+3)
=x(x-3)