Treść zadania

Proszę o pomoc
zdjęcie z zadaniem
http://imageshack.us/f/860/matmas.jpg/

Edit: Zadane(kropka)pl jest lepsze rozwiązanie :
4. 2 1/2 : 1 1/4 + 4 4/5 * 3 3/4 =
= 5/2 : 5/4 + 24/5 * 15/4=
= 2 + 18 = 20

5. (3 1/4 - 1 3/5) * 1 1/3 / 2 1/5=
= (13/4 - 8/5) * 4/3 / 11/5 =
= (65/20 - 32/20) * 4/3 / 11/5 =
= 33/20 * 4/3 / 11/5 =
= 44/20 : 11/5 =
= 44/20 * 5/11 = 1

6. 6 1/4 : 4 5/8 - 3 1/6 / 2 1/3 =
= 25/4 : 37/8 - 19/6 / 7/3 =
= 25/4 : 222/48 - 152/48 / 7/3 =
= 25/4 : 70/48 : 7/3 =
= 25/4 : (70/48 : 7/3) =
= 25/4 : (70/48 * 3/7) =
= 25/4 : 10/16 =
= 25/4 * 16/10 =
= 20/2 = 10

7. 4,7 + 18,32 + 7,34 + 12,85 + 20,79 =
= 4 7/10 + 18 2/100 + 7 34/100 + 12 85/100 + 20 79/100 =
= 47/10 + 1832/100 + 734/100 + 1285/100 + 2079/100 =
470/100 + 1832/100 + 734/100 + 1285/100 + 2079/100 =
= 6400/100 = 64

8. (8,05 - 7,6) * 100 =
= (8 5/100 - 7 6/10) * 100 =
= (805/100 - 76/10) * 100 =
= (805/100 - 760/100) * 100 =
= 45/100 * 100 = 45

9. 38 : 0,95 =
= 3800 : 95 =
= 40

10. (3,5 + 4 12/20) - 1,02 * 5 =
( 3 5/10 + 92/20) - 1 2/100 * 5 =
= ( 35/10 + 92/20) - 102/100 * 5 =
= (70/20 + 92/20) - 102/100 * 5 =
= 162/20 - 102/100 * 5 =
= 810/100 - 102/100 * 5 =
= 708/100 * 5 =
= 708/20 = 35 8/20 = 35 2/5