问题描述：
用matlab求方程组的解,必须用矩阵知识.
w1=2000;
w2=3000;
w3=1000;
w4=500;
w5=4000;
w6=2000;
w7=1000;
t1=48.7;
t2=51.9;
t3=61.2;
t4=71.8;
t5=48.7;
t6=51.9;
t7=64.0;
w1*n11+w2*n21+w3*n31+w4*n41+w5*n51+w6*n61+w7*n71+w1*n12+w2*n22+w3*n32+w4*n42+w5*n52+w6*n62+w7*n72
Lt=t5*n51+t5*n52+t6*n61+t6*n62+t7*n71+t7*n72
w1=2000;
w2=3000;
w3=1000;
w4=500;
w5=4000;
w6=2000;
w7=1000;
t1=48.7;
t2=51.9;
t3=61.2;
t4=71.8;
t5=48.7;
t6=51.9;
t7=64.0;
w1*n11+w2*n21+w3*n31+w4*n41+w5*n51+w6*n61+w7*n71+w1*n12+w2*n22+w3*n32+w4*n42+w5*n52+w6*n62+w7*n72
Lt=t5*n51+t5*n52+t6*n61+t6*n62+t7*n71+t7*n72
问题解答：
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