爱上海后花园

试说明不论x取何值,代数式(x3+5×2+4x-1)-(-x2-3x+2×3-3)+(8-7x-6×2+x3)的值恒不变 求讲解

=x35x24x1x23x2x3387x6x2x3=x32x3x35x2x26x24x3x7x138=00010=10...

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