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3.09减去1.15与

(3.09-7\12)除以(1.15+1\12)乘以10% =(188/75)/(37/30)*10% =376/185*10% =188/925 =0.2032

3.09-(1.15+3/20) =3.09-(1.15+0.15) =3.09-1.3 =1.79 百分之十等于0.1 1.79*0.1=0.179

1.15 × 0.07 = 0.0805≈0.08 3.09 × 0.6 = 1.854≈1.85 竖式见图:

(1)设x=0.8787...,则100x=87+0.8787..; 100x=87+x ,x=87/99 ,所以0.8787..=87/99 同理0.7878...=78/99 87/99-78/99=10/99 (2)1.1919..=1+0.1919..=1+19/99 ,0.1515..=15/99 2.77..=2+7/9 3.0909...=3+0.0909...=3+9/99 (1+19/99)+15/99+(2+7/9...

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