看不清楚是次方还是相乘,写好写吧
(-x 2x2-3 x 1) 2(x 2x -5)-(4x2-3x 5 x 1)的计算
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.解线性方程组|X1+X2+X3+X4=5 |X1+2X2-X3+4X4=-2 |2X1-3X2-X3-5X4=-2 |