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令x+1分之1為a,y-2分之1為b, 得方程組:5a+4b=2① 7a-3b=13分之20② 令①乘3+②乘4得: 43a =6+5分之13 解得:a=5分之一 則x=4 同理解得b=4分之一 則y=6
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