Question

zad.4 strona 35 1gim
Oblicz.


(a) (3/4 - 1/5):1/2
(b) 3,2:(0,8 - 2/5)
(c) 2/3 * (1/2 - 1/6)
(d) 4,81+1/3*(1,2-0,6)
(e) (1-7/9)*(5,2-0,7)
(f) 123:10+0,2*6,1
(g) (6,5-7,7):(4-2 1/5)
(h) (1,5-1 1/3)*2 2/5 - 1
(i) (6,25- 2 1/2):2 1/7-1

Answer 1

a)   (3/4 - 1/5):1/2= (15/20-4/20): 1/2 = 11/20 · 2/1 = 11/10 = 1 i 1/10

b)   3,2:(0,8 - 2/5) = 3 i 2/10: ( 8/10 - 4/10) = 32/10 · 10/4 = 8

c)   2/3 * (1/2 - 1/6) = 2/3 · (3/6-1/60 = 2/3 · 2/6 = 2/9

d)   4,81+1/3*(1,2-0,6) = 4,81+ (1/3 · 6/10) = 4,81 + 1/5 = 4,81+0,20 = 5,01

e)   (1-7/9)*(5,2-0,7)= 2/9 · 4 i 1/2 = 1

f)   123:10+0,2*6,1= 12,3+ 1,22 = 13,52

g)   (6,5-7,7):(4-2 1/5) = (-1,2) : (1 i 4/5) = -2/3

h)   (1,5-1 1/3)*2 2/5 - 1= (1 i 3/6 - 1 i 2/6) · 2 i 2/5 = 1/6 · 12/5 = 1 i 1/5

i)   (6,25- 2 1/2):2 1/7-1 = (6 i 1/4 - 2 i 2/4) : 1 i 1/7 = (3 i 3/4 :2) - 1 = 7 i 1/2 - 1 = 6 i 1/2