3x+5(x+y)=36 3x+4(x+y)=36
13个回答
3x+5(x+y)=36 (1)
3x+4(x+y)=36 (2)
(1)-(2)
x+y=0
y=-x
代入(1)
3x+0=36
所以x=12
y=-x=-12
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