Question

НАЙДИТЕ ЗНАЧЕНИЯ ВЫРАЖЕНИЯ а)(7/15+7/30+4/5):(2-1/3-1/2)           б)17:(3\\5+1\\4)+(7\\8-1\\4)*(4\\5)2 решение  

Answer 1

1)7/15+7/30+4/5=(14+7+28)/30=1 19/30=49/30
2)49/30:7/6=294/210=1 84/210=1 42/105

17:(3/5+1/4)+(7/8-1/4)*(4/5)2=20,8
1)3/5+1/4= (12+5)/20=17/20
2)17:17/20=20
3)7/8-1/4=(7-2)/4=5/4
4)5/4*16/25=4/5
20+4/5=20.4/5=20,8

Answer 2

а) (7/15 + 7/30 + 4/5) : (2 - 1/3 - 1/2) = (14/30 + 7/30 + 18/30) : (6/6 - 2/6 - 3/6) = 39/30 : 1/6 = 39/30 * 6/1 = 13.

б) 17 : (3/5 + 1/4) + (7/8 - 1/4) * (4/5)2 = 17 : (12/20 + 5/20) + (28/40 - 10/40) * 16/25
= 17 : 17/20 + 18/25 = 20/20 + 18/25 = 1 18/25.