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2/3x÷3/4=18 2-6/13÷9/39-2/3

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2/3x÷3/4=18 2-6/13÷9/39-2/3
2/3x÷3/4=18 2-6/13÷9/39-2/3
x/2+y/3=13/2,(1)x/3-y/4=3/2,(2)(1)*3 变3x+2y=39,(3)
(2)*2变4x-3y=18 (4)
(3)+(4)
X=9,代入(3)得Y=6 解得 X=9,Y=6
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