MATLAB编程求解方程组，写出程序
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syms x1 x2 x3
>> [A, b] = equationsToMatrix([3*x1-x2+2*x3==7, -x1+2*x2-2*x3==-1, 2*x1-2*x2+4*x3==0], [x1,x2,x3])
A =
[ 3, -1, 2]
[ -1, 2, -2]
[ 2, -2, 4]
b =
7
-1
0
>> s=A\b
s =
7/2
-1
-9/4
>> [A, b] = equationsToMatrix([3*x1-x2+2*x3==7, -x1+2*x2-2*x3==-1, 2*x1-2*x2+4*x3==0], [x1,x2,x3])
A =
[ 3, -1, 2]
[ -1, 2, -2]
[ 2, -2, 4]
b =
7
-1
0
>> s=A\b
s =
7/2
-1
-9/4
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