3(x-2)(x+1)-2(x-5)(x-3)
问题描述:
3(x-2)(x+1)-2(x-5)(x-3)
答
3(x-2)(x+1)-2(x-5)(x-3)
=3(x²-x-2)-2(x²-8x+15)
=3x²-3x-6-2x²+16x-30;
=x²+13x-36;
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