x(x-4)(x+4)-(x+3)(x²-6x+9)+5x³y²÷(x²y²) 其中X=-3 化简求值

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x(x-4)(x+4)-(x+3)(x²-6x+9)+5x³y²÷(x²y²)其中X=-3化简求值x(x-4)(x+4)-(x+3)(x²-

x(x-4)(x+4)-(x+3)(x²-6x+9)+5x³y²÷(x²y²) 其中X=-3 化简求值
x(x-4)(x+4)-(x+3)(x²-6x+9)+5x³y²÷(x²y²) 其中X=-3 化简求值

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

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