因式分解练习题及答案(要有两种方法的)
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5ax+5bx+3ay+3by
=5x(a+b)+3y(a+b)
=(5x+3y)(a+b)
x³-x²+x-1
=(x³-x²)+(x-1)
=x²(x-1)+(x-1)
=(x-1)(x²+1)
x²-x-y²-y
=(x²-y²)-(x+y)
=(x+y)(x-y)-(x+y)
=(x+y)(x-y+1)
=5x(a+b)+3y(a+b)
=(5x+3y)(a+b)
x³-x²+x-1
=(x³-x²)+(x-1)
=x²(x-1)+(x-1)
=(x-1)(x²+1)
x²-x-y²-y
=(x²-y²)-(x+y)
=(x+y)(x-y)-(x+y)
=(x+y)(x-y+1)
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