会用1stOpt的帮忙解一下这题x1+x2+r=qx1-x2-x3=0x3-x1=w其中r=0.072,q=6.882,w=0.368若能同时给出MATLAB及1stOpt的答案者优先

Question

会用1stOpt的帮忙解一下这题
x1+x2+r=q
x1-x2-x3=0
x3-x1=w
其中r=0.072,q=6.882,w=0.368
若能同时给出MATLAB及1stOpt的答案者优先

Answer 1

1stOp没有用过,用matlab很简单,共4行语句：
r=0.072,q=6.882,w=0.368
A=[1 1 0;1 -1 -1;-1 0 1]
B=[q-r;0;w]
X=A\B
运行结果：
A =
1 1 0
1 -1 -1
-1 0 1
B =
6.8100
0
0.3680
X =
7.1780
-0.3680
7.5460