1).6+2=8(д) За час
2).8×6=48(д) за 6 часов
(4 1/3 - (2/5)^2 + 3 1/75) : 4/75 = 134 3/4
1) (2/5)^2 = 4/25,
2) 4 1/3 - 4/25 + 3 1/75 = 13/3 - 4/25 + 226/75 = 325/75 - 12/75 + 226/75 = 539/75 = 7 14/75,
3) 7 14/75 : 4/75 = 539/75 * 75/4 = 539/4 = 134 3/4 (или 134,75)
-14-(34-59) =
-14-(-25) =
-14 + 25 = 11
15(3-X)=453-X= 45:15
3-X=3
X= 3-3
x=0