Question

Oblicz:
a) 2 1/5 + 56 x 35=
b) 7- 4/5 : 1 1/2=
c) 1 1/4 x 1 3/5 - (0,8- 0,55)=
d) 4 1/2 x 2/3 - 3/4=
e) 4,5 x 2 + 0,4 x 5=
f) 20 - 3/4 : 0,1=

Daje naj prosze o szybką odp :)

Answer 1

a) 2 1/5 + 5/6 x 3/5= 2 1/5 + 1/3= 11/5 = 1/3=33/15 +5/15= 38/15=28/15

b) 7- 4/5 : 1 1/2= 7/1 - 4/5 : 1 1/2 = 7/1 - 4/5 : 3/2 = 7/1 - 4/5 x 2/3 = 7/1 - 8/15 = 105/15 - 8/15 = 97/15 = 6 7/15

c) 1 1/4 x 1 3/5 - (0,8- 0,55)= 1 1/4 x 1 3/5 - (4/5- 55/100)=
1 1/4 x 1 3/5- 25/100=5/4 x 8/5 - 25/100=1/4 x 8/1 - 25/100=2 - 0,25= 1,75

d) 4 1/2 x 2/3 - 3/4= 9/2 x 2/3 - 3/4= 3/1 x 1/1 - 3/4= 3/1 - 3/4= 12/4 - 3/4=
 9/4=2 1/4

e) 4,5 x 2 + 0,4 x 5= 9 + 2 = 11

f) 20 - 3/4 : 0,1= 20 - 3/4 : 1/10 = 20 - 3/4 x 10/1 =  20 - 30/4 = 20 - 7 2/4=
20 - 7 1/2 = 20/1 - 15/2 = 40/2 - 15/2= 25/2 = 12 1/2