x³+2x²-10x-2 用分组分解法因式分解
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x³+2x²-10x-2 用分组分解法因式分解
x³+2x²-10x-20
=x³-10x+2x²-20
=x(x²-10)+2(x²-10)
=(x²-10)(x+2)
x³+2x²-10x-2 用分组分解法因式分解
x³+2x²-10x-20
=x³-10x+2x²-20
=x(x²-10)+2(x²-10)
=(x²-10)(x+2)