若X1-X5满足下列方程组2乘X1 +X2+X3+X4+X5=6X1+ 2乘X2 +X3+X4+X5=12X1+X2+
4个回答
五式相加,得:
X1+X2+X3+X4+X5=31
x4=48-31=17
x5=96-31=65
3乘X4+X5
=3*17+65
=116.
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