作业帮x(x-4)(x+4)-(x+3)(x²-6x+9)+5x³y²÷(x²y
来源：学生作业帮 编辑：作业帮 分类：数学作业 时间：2024/10/06 20:27:34
x(x-4)(x+4)-(x+3)(x²-6x+9)+5x³y²÷(x²y²) 其中X=-3 化简求值
原式=x(x²-16)-(x³-6x²+9x+3x²-18x+27)+5x
=3x²-2x
∴当x=-3时,原式=3×(-3)²-2×(-3)=-21
再问： 能把过程写详细点吗
再答： 原式=x(x²-16)-(x³-6x²+9x+3x²-18x+27)+5x =x³-16x-x³+6x²-9x-3x²+18x-27+5x =3x²+(23x-25x) =3x²-2x ∴当x=-3时，原式=3×(-3)²-2×(-3)=-21
=3x²-2x
∴当x=-3时,原式=3×(-3)²-2×(-3)=-21
再问： 能把过程写详细点吗
再答： 原式=x(x²-16)-(x³-6x²+9x+3x²-18x+27)+5x =x³-16x-x³+6x²-9x-3x²+18x-27+5x =3x²+(23x-25x) =3x²-2x ∴当x=-3时，原式=3×(-3)²-2×(-3)=-21
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