Вычислите: 15 1/2-(6 1/4+2 3/8).вычислите: а) 2/15+(1/15+1/3); б) 1/20+2/15+3/20+1/15; в)...

Question

Вычислите: 15 1/2-(6 1/4+2 3/8).вычислите: а) 2/15+(1/15+1/3); б) 1/20+2/15+3/20+1/15; в) 3/4+2/3-17/12.плиз

Answer 1

15 1/2 - (6 1/4 + 2 3/8) = 6 7/8
1) 6 1/4 + 2 3/8 = 6 2/8 + 2 3/8 = 8 5/8
2) 15 1/2 - 8 5/8 = 15 4/8 - 8 5/8 = 14 12/8 - 8 5/8 = 6 7/8

а) 2/15 + (1/15 + 1/3) = 2/15 + (1/15 + 5/15) = 2/15 + 6/15 = 8/15
б) (1/20 + 3/20) + (2/15 + 1/15) = 4/20 + 3/15 = 1/5 + 1/5 = 2/5
в) (3/4 + 2/3) - 17/12 = (9/12 + 8/12) - 17/12 = 17/12 - 17/12 = 0