( - 25,2 : ( - 5,6 + 3,2) ) * 7,2 : (-3,6) = -21
1) - 5,6 + 3,2 = - (5,6 - 3,2) = - 2,4
2) - 25,2 : ( - 2,4) = 252 : 24 = 10,5
3) 10,5 * 7,2 = 75,6
4) 75,6 : (-3,6) = - (756 : 36) = -21
-8/25 : ( - 3 1/5) : ( - 1 1/4) = - 0,08
1) - 8/25 : (- 3 1/5) = - 8/25 : ( - (3*5+1)/5) =
= 8/25 * 5/16 = (1*1)/(5*2) = 1/10
2) 1/10 : ( - 1 1/4) = 1/10 : ( - (1*4 + 1)/4) =
= 1/10 * ( - 4/5) = - 4/50 = - 8/100 = - 0,08
1 8/9 : ( 1 3/4 - 3 1/6 ) = - 1 1/3
1) 1 3/4 - 3 1/6 = (1*4+3)/4 - (3*6 + 1)/6 =
= 7/4 - 19/6 = (7*3)/(4*3) - (19*2)/(6*2) =
= 21/12 - 38/12 = - (38 -21)/12 = - 17/12 =
= - 1 5/12
2) 1 8/9 : (- 1 5/12) = (1*9 + 8)/9 : ( - (1*12 +5)/12 ) =
= 17/9 * (- 12/17) = - (1*4)/(3*1) = - 4/3 = - 1 1/3