x2-9y2+2x-6y因式分解.急
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x2-9y2+2x-6y因式分解.急x2-9y2+2x-6y因式分解.急x2-9y2+2x-6y因式分解.急x2-9y2+2x-6y=(x-3y)(x+3y)+2(x-3y)=(x-3y)(x+3y+
x2-9y2+2x-6y因式分解.急
x2-9y2+2x-6y因式分解
.急
x2-9y2+2x-6y因式分解.急
x2-9y2+2x-6y
=(x-3y)(x+3y)+2(x-3y)
=(x-3y)(x+3y+2)
4x^3-xy^2
=x(4x^2-y^2)
=x(2x+y)(2x-y)
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