Question

3.oblicz
c)3 1/4 x (0,75 - 5/8)=

4.oblicz
c) 8 - 3 7/11=

5.Oblicz
a) 3 3/4 x 8/10=
b) 6 3/4 : 1 1/2=
c) 8/9 x 7 x 7 5/7=

6.oblicz
a)3 7/9 + 4,2=
b)6,32 - 1 3/5=
c)2 1/3 x 3,6=
d)3 7/20 : 0,125=

7.Oblicz
a) (0,4 + 0,75 x 2/5) : 10=
b) (4 - 2 3/7) x (3,8 - 2,4)=

Answer 1

Zad. 3c) 
3 i 1/4 * (0,75 - 5/8) = 
13/4 * ( 3/4 - 5/8) = 
13/4 * ( 12/16 - 10/16) = 
13/4 * 2/16 = 
13/4 * 1/8 = 13/32

zad.4c)
8 - 3  i 7/11= 4 i 4/11

zad. 5
a) 3 i 3/4 * 8/10=  15/4 * 4/5 = 60/20 = 3
b) 6 i 3/4 : 1 i 1/2= 27/4 : 3/2  = 27/4 * 2/3 = 54/12 = 4 i 6/12 = 4 i 1/2
c) 8/9 * 7 * 7 i 5/7= 56/9 * 54/7 = 3024/63 = 48

zad. 6 
a)3 i 7/9 + 4,2= 34/9 + 42/10 = 34/9 + 21/5 = 170/45 + 189/45 = 359/45 = 7 i 44/45
b)6,32 - 1 i 3/5= 6,32 - 1,6 = 4,72
c)2 i 1/3 * 3,6=  7/3 * 36/10 = 7/3 * 18/5 = 126/15 = 8 i 6/15 = 8 i 2/5 = 8,4
d)3 i 7/20 : 0,125= 67/20 : 125/1000 = 67/20 : 1/8 = 67/20 * 8/1 = 536/20=26 i 16/20 = 26 i 8/10 = 26,8 

zad.7
a) (0,4 + 0,75 * 2/5) : 10= (4/10 + 3/4 * 2/5) : 10 = (2/5 + 6/20) : 10 = ( 8/20 + 6/20) : 10 = 14/20 * 1/10 = 14/200 = 7/100 = 0,07 
b) (4 - 2 i 3/7) x (3,8 - 2,4)= 1 i 4/7 * 1,4 = 11/7 * 14/10 = 11/7 * 7/5 = 77/35= 2 i 7/35 = 2 i 1/5 = 2,2