Question

1. Oblicz : a) (1/3 + 2/7) : ( 1- 1/9) + 3/7

b) (36 : 21/50 - 75 3/14) : 3

C) (1 1/4 * 2,2 - 7,5/5 * 3/4) : 10 do potęgi 3

Answer 1

a)

(1/3+2/7):(1-1/9)+37=

(7/21+6/21):(9/9-1/9)+3/7=

13/21:8/9+3/7=

13/21*9/8+3/7=

39/56+3/7=

39/56+24/56=

63/56=

1 1/8

 

b)

(36:21/50-75 3/14):3=

(36/1*50/21-1053/14)*1/3= skracamy

(12/1*50/7-1053/14)*1/3=

(600/7-1053/14)*1/3=

(1200/14-1053/14)*1/3=

147/14*1/3=skracamy

49/14=

3 1/2

 

c)

(1 1/4*2,2-7,5/5*3/4):10 do pot3=

(5/4*11/5-1,5*3/4):1000= skracamy ułamki a 1,5 wychodzi z dzielenia7,5:5

(11/4-3/2*3/4):1000=

(11/4-9/8):1000=

(22/8-9/8):1000=

13/8*1/1000=

13/8000