当a=-2,b=-3时,求3a²b-[2a²b-(2ab-a²b)-4a²]-3
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当a=-2,b=-3时,求3a²b-[2a²b-(2ab-a²b)-4a²]-3ab的值
当a=-2,b=-3时,
求3a²b-[2a²b-(2ab-a²b)-4a²]-3ab的值
当a=-2,b=-3时,
求3a²b-[2a²b-(2ab-a²b)-4a²]-3ab的值
3a²b-[2a²b-(2ab-a²b)-4a²]-3ab
=3a²b-[2a²b-2ab+a²b-4a²]-3ab
=3a²b-[3a²b-2ab-4a²]-3ab
=2ab+4a²-3ab
=-ab+4a²
=-(-2*-3)+4*(-2)²
=-6+16
=10
再问: �Ȼ�������ֵ��4x��3�η�-[-x��ƽ��+2(x������-3��֮1x��ƽ��)]������x=-3
再答: 4x³-[-x²+2��x³-1/3x²��] =4x³-[-x²+2x³-2/3x²��] =4x³-[-5/3x²+2x³] =2x³+5/3x² =x²��2x+5/3�� =��-3��²��-6+5/3�� =-54+9*5/3 =-54+15 =-39
=3a²b-[2a²b-2ab+a²b-4a²]-3ab
=3a²b-[3a²b-2ab-4a²]-3ab
=2ab+4a²-3ab
=-ab+4a²
=-(-2*-3)+4*(-2)²
=-6+16
=10
再问: �Ȼ�������ֵ��4x��3�η�-[-x��ƽ��+2(x������-3��֮1x��ƽ��)]������x=-3
再答: 4x³-[-x²+2��x³-1/3x²��] =4x³-[-x²+2x³-2/3x²��] =4x³-[-5/3x²+2x³] =2x³+5/3x² =x²��2x+5/3�� =��-3��²��-6+5/3�� =-54+9*5/3 =-54+15 =-39
当a=-2,b=-3时,求3a²b-[2a²b-(2ab-a²b)-4a²]-3
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