Question

8 3/4(a+b),если a= 2 1/7, b= 1 1/7

Answer 1

$8 frac{3}{4} (a+b)=8 frac{3}{4} (2 frac{1}{7} +1 frac{1}{7})=8 frac{3}{4} ( frac{15}{7} + frac{8}{7})=frac{35}{4} ( frac{15+8}{7})=frac{35*23}{4*7} =frac{805}{28}=28frac{75}{100} =28frac{3}{4}$