Giải thích các bước giải:

`B = 5/2.7 + 16/7.9 - 2/9.11 - 29/11.18`

`B=` $\dfrac{7 -2}{2.7}$ `+` $\dfrac{2+14}{7.9}$ `-`$\dfrac{11-9}{9.11}$`-` $\dfrac{7+22}{11.18}$

`B=`$\dfrac{7}{2.7}-\dfrac{2}{2.7}$`+`$\dfrac{2}{7.9}+\dfrac{14}{7.9}$`-`$\dfrac{11}{9.11}+\dfrac{9}{9.11}$`-`$\dfrac{7}{11.18}-\dfrac{22}{11.18}$

`B = 1/2 -1/7+1/7-1/9+2/9-1/9+1/11-1/11+1/18-1/9`

`B = 1/2+1/18-1/9`

`B = 9/18+1/18-2/18`

`B=4/9`

Ta có `B = 4/9` 

`1/3 = 3/9` 

vì `4/9 > 3/9` nên `B > 1/3`

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