Question

вычислите значение выражения наиболее удобным способом
1)3 3/7*2 213+2 1/7*2 2/13=
2)2 2/9*7 15+1112-7 1/5*1 3/4=

Answer 1

1) 3 3/7 * 2 2/13 + 2 1/7 + 2 2/13 = 2 2/13 * (3 3/7 + 2 2/7) = 2 2/13 * 5 5/7 =
    28/13 * 40/7 = 160 /13 = 12 4/13
2) 2 2/9 * 7 1/5 + 11/12 - 7 1/5 * 1 3/4 = 7 1/5 * (2 2/9 + 1 3/4) + 11/12 = 
7 1/5 * (3 + (2/9 + 3/4)) + 11/12 = 7 1/5 * (3 + (8/36 + 27/36) + 11/12 = 
7 1/5 * 3 35/36 + 11/12 = 36/5 * 143/36 + 11/12 = 143/5 + 11/12 = 715/60 + 55/60 = 770/60 = 12 50/60 = 12 5/6