Question

Найдите сумму: 1) 5 7/8+6 3/10; 2) 6 3/8+ 2 5/9; 3) 1 8/21+4 3/14+2 2/7

Answer 1

$1) 5 frac{7}{8} +6 frac{3}{10} =5 frac{7*5}{8*5}+6 frac{3*4}{4*10}=5 frac{35}{40}+6 frac{12}{40}=11 frac{47}{40}=12 frac{7}{40}$

$2)6 frac{3*9}{8*9} + 2 frac{5*8}{9*8}=6 frac{27}{72}+2 frac{40}{72}=8 frac{67}{72}$

$3)1 frac{8*2}{21*2}+4 frac{3*3}{14*3} +2 frac{2*6}{7*6}=1 frac{16}{42}+4 frac{9}{42}+2 frac{12}{42}=7 frac{37}{42}$