Question

Tính nhanh:

a).31/17+5/13+8/13-14/17 ; b).5/7x22/11+5/7x9/11+5/7

Answer 1

a,\(\frac{31}{17}+\frac{5}{13}+\frac{8}{13}-\frac{14}{17}=\left(\frac{31}{17}-\frac{14}{17}\right)+\left(\frac{5}{13}+\frac{8}{13}\right)=1+1=2\)                                                              b,\(\frac{5}{7}.\frac{22}{11}+\frac{5}{7}.\frac{9}{11}+\frac{5}{7}=\frac{5}{7}.\left(\frac{22}{11}+\frac{9}{11}+1\right)=\frac{5}{7}.4=\frac{20}{7}\)

Answer 2

thank

Answer 3

a) \(\frac{31}{17}+\frac{5}{13}+\frac{8}{13}-\frac{14}{17}\)

    \(=\left(\frac{31}{17}-\frac{14}{17}\right)+\left(\frac{5}{13}+\frac{8}{13}\right)\)

     \(=1+1\)

      \(=2\)

b) \(\frac{5}{7}\cdot\frac{22}{11}+\frac{5}{7}\cdot\frac{9}{11}+\frac{5}{7}\)

    \(=\frac{5}{7}\cdot\left(\frac{22}{11}+\frac{9}{11}+1\right)\)

      \(=\frac{5}{7}\cdot\frac{42}{11}\)

        \(=\frac{30}{11}\)