(0.8,0.2)=5(3,5)=1.6(1/2,1/3)=5/2 (5/2就是二分之五的意思)(X,1/5)=4找规律的 求X得几
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![(0.8,0.2)=5(3,5)=1.6(1/2,1/3)=5/2 (5/2就是二分之五的意思)(X,1/5)=4找规律的 求X得几](/uploads/image/z/2653292-20-2.jpg?t=%EF%BC%880.8%2C0.2%EF%BC%89%3D5%EF%BC%883%2C5%EF%BC%89%3D1.6%EF%BC%881%2F2%2C1%2F3%29%3D5%2F2+%285%2F2%E5%B0%B1%E6%98%AF%E4%BA%8C%E5%88%86%E4%B9%8B%E4%BA%94%E7%9A%84%E6%84%8F%E6%80%9D%29%EF%BC%88X%2C1%2F5%29%3D4%E6%89%BE%E8%A7%84%E5%BE%8B%E7%9A%84+%E6%B1%82X%E5%BE%97%E5%87%A0)
(0.8,0.2)=5(3,5)=1.6(1/2,1/3)=5/2 (5/2就是二分之五的意思)(X,1/5)=4找规律的 求X得几
(0.8,0.2)=5
(3,5)=1.6
(1/2,1/3)=5/2 (5/2就是二分之五的意思)
(X,1/5)=4
找规律的 求X得几
(0.8,0.2)=5(3,5)=1.6(1/2,1/3)=5/2 (5/2就是二分之五的意思)(X,1/5)=4找规律的 求X得几
可以看出,这个规律是
(x,y)=x/y+1
(X,1/5)=x/(1/5)+1=5x+1=4
=>x=3/5
(0.8+0.2)/0.2=5
(3+5)/5=1.6
(1/2+1/3)/(1/3)=2.5
所以x=4*(1/5)-1/5=0.6
3/5(a,b)=c=(a+b)/b
(X+1/5)/ 1/5 =4
解得:X=3/5