X+y=10 2x+y=8 x = y=
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X+y=102x+y=8x=y=X+y=102x+y=8x=y=X+y=102x+y=8x=y=x=10-y2(10-y)+y=820-2y+y=8y=12x=-2希望有用
X+y=10 2x+y=8 x = y=
X+y=10 2x+y=8 x = y=
X+y=10 2x+y=8 x = y=
x=10-y
2(10-y)+y=8
20-2y+y=8
y=12
x=-2 希望有用
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