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x1+x2=多少
x1=2x2
x1-x二等于多少
x1^2×x2^2等于多少
x1+2x2-2x3+2x4-x5=0
x1^2+2x1x2+2x2^2+4x2x3+4x3^2
x1x2等于1
x1+2x2-x3-2x4=0
x1+2x2+2x3+x4=0 2x1+x2-2x3-2x4
x1-2x2+x3+2x4=0
x1^2x2+x1x2^2
x1+2x2-2x3+2x4=2 x2-x3-x4=1
x1+2x2+x3=1
x1+2x2-x3=1
x1^2 -x 2^2=0
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