x+x+x+y=20 x+x+y=14 x=?y=?
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x+x+x+y=20 x+x+y=14 x=?y=?
x+x+x+y=20 x+x+y=14 x=?y=?
x+x+x+y=20 x+x+y=14 x=?y=?
x+x+x+y=20 ---(1)
x+x+y=14 -------(2)
(1)-(2)得x =6---(3)
将(3)代入(2) 6+6+y =14
所以 y=2
3x+y=20
2x+y=14
解得:x=6,y=2
x=6 y=2
x+x+x+y=20 x+x+y=14 x=?y=?
y=x(x
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