{1/3(x+y)=3,3-1/2x=2(3-1/2y) 二元一次方程,你们懂得,速度回答
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{1/3(x+y)=3,3-1/2x=2(3-1/2y) 二元一次方程,你们懂得,速度回答
{1/3(x+y)=3,3-1/2x=2(3-1/2y) 二元一次方程,你们懂得,速度回答
{1/3(x+y)=3,3-1/2x=2(3-1/2y) 二元一次方程,你们懂得,速度回答
1/3(x+y)=3,
3-1/2x=2(3-1/2y)
即
x+y=9.(1)
-x+2y=6.(2)
(1)+(2)得
3y=15
y=5
x=9-5=4
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