Question

Oblicz i wynik podaj w postaci ulamka dziesietnego zaokraglajac do 0,01 :
a) [7/9 x (-1,5) + 3,25 x 1/4 ] : (-1/3)
b) (1 2/3 - 1.2 ) : (5,8 + 2 1/3 ) - (-1/2)
c)1 1/3 : (-2) + [4,8 x ( - 1/2 ) + 5 ]
d) 1 1/4 - [1/2 + 3/5 x (-1.2 )]x (-2)
Daje naj :) Proszee

Answer 1

A)
[ 7/9 *(-1,5) +3,25 *1/4 ] : (-1/3) =
[ 7/9 *(-1i1/2) + 3i1/4 * 1/4] :(-1/3) =
[ 7/9 * (-3/2) + 13/4 * 1/4] : (-1/3) =
[ 7/3 * (-1/2) + 13/16 ] : (-1/3) =
[ - 7/6 + 13/16) :(-1/3) = 
[ - 56/48 + 39/48 ] : (-1/3) =
[ - 17/48 ] : (-1/3) 
-17/48 * (-3/1) = 51/48 = 1 i 3/48 = 1 i 1/16

b)
(1i2/3 -1,2) : (5,8 + 2i1/3) - (-1/2) =
(1i2/3 - 1i1/5) : (5i4/5 + 2i1/3) - (-1/2) =
(1i10/15 - 1i3/15) : (5i12/15 + 2i5/15) - (-1/2) =
7/15 : 7i17/15 -(-1/2) =
7/15 : 122/15 -(-1/2) =
7/15 * 15/122 - (-1/2) =
7/1 * 1/122 - (-1/2) =
7/122 + 61/122 = 68/122 = 34/61 

c)
1i1/3 : (-2) + [4,8 *(-1/2) +5] =
4/3 ; (-2/1) + [ 4i4/5 * (-1/2) + 5] =
4/3 * (-1/2) +[ 24/5 * (-1/2) +5 ] =
2/3 * (-1/1) + [ 12/5 * (-1/10 + 5] =
- 2/3 + [ (-12/5) + 5] =
- 2/3 + [ -2 i 2/5 + 4i5/5] =
- 2/3 + 2i3/5 =
- 10/15 + 2i9/15 =
- 10/125+ 1 i 24/15 = 1i14/15 

d)
1i1/4 -[1/2 +3/5 *(-1/2)] * (-2) =
1i1/4 - [ 1/2 -3/10 ] * (-2) =
1i1/4 - [ 5/10 - 3/10 ] * (-2) =
1 i1/4 - 2/10  *(-2)=
1,25 - 0,2 * (-2) =
1,25 - (-0,4) = 1,65