Вычислите: (3/4-5/12)*8+1/18; б) 1/3*(3/5*5/7)+1/3*(5/9*9/7); - вопрос №532809534512811813355713599771261 от dashabur2005 01.12.2020 02:52

Question

Математика: Вычислите: (3/4-5/12)*8+1/18; б) 1/3*(3/5*5/7)+1/3*(5/9*9/7); в) 7/12*6/17+1/8: 17/6;

dashabur2005 · Answer

А) (3/4-5/12)*8+1/18 = 2 целых 13/18
1) 3/4 - 5/12 = 1/3
2) 1/3*8= 8/3
3) 8/3+1/18= 49/18 = 2 целых 13/18
б) 1/3*(3/5*5/7)+1/3*(5/9*9/7)= 8/21
1)3/5*5/7= 3/7
2)5/9*9/7=5/7
3)1/3*3/7=1/7
4)1/3*5/7=5/21
5)1/7+5/21=8/21
в) 7/12*6/17+1/8:17/6 = 1/4
1)7/12*6/17 = 7/34
2)1/8:17/6 = 3/68
3)7/34+3/68=1/4