3x(x²+2x+7)-(x²+7)(3x-5)
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3x(x²+2x+7)-(x²+7)(3x-5)
3x(x²+2x+7)-(x²+7)(3x-5)
3x(x²+2x+7)-(x²+7)(3x-5)
原式=(3x³+6x²+21x)-(3x²-5x²+21x-35)
=3x³+6x²+21x-3x²+5x²-21x+35
=11x²+35