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( )/2.4=3.6/1.2 7.5/( )=2.5/12 2.7/( )=3/9 1.6/...

7.5x2.3+1.9x2.5+12.5x0.4 =2.5x3x2.3+1.9x2.5+2.5x5x0.4 =2.5x(6.9+1.9+2) =2.5x10.8 =2.5x(10+0.8) =2.5x10+2.5x0.8 =25+2 =27

12÷7.5+12÷2.5 =12×2/15+12×2/5 =12×(2/15+2/5) =12×8/15 =6.4

分子是1,3,5,7,9,11,............. 2n-1 分母是3X(1,2,3,4,5,6,..........) 3n 所以第30个数是:59/90 第45个数是:89/135

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