介个题还有点小意思
(a+b+c) + (b+2c) = 30
(a+b+c) + 2(b+2c) = 8
x +y = 30
x +2y = 8
y = -22
x=52
介个题还有点小意思
(a+b+c) + (b+2c) = 30
(a+b+c) + 2(b+2c) = 8
x +y = 30
x +2y = 8
y = -22
x=52
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