Odpowiedź:
a) 2/3 + 0,6= 2/3 + 6/10 = 20/30 + 18/30= 38/30= 1 8/30= 1 4/15
b) 4,2- 1 1/9 = 4 2/10 - 1 1/9 = 42/10 - 10/9= 378/90- 100/90 = 278/90= 3 8/90=
= 3 4/45
c) 3,6 - 1 1/2 = 36/10 - 3/2 = 36/10 - 15/10= 21/10 = 2 1/10
d) 2 1/3 : 0,8 = 7/3 : 8/10 = 7/3 * 10/8 = 70/24 = 2 11/12
e) 5,2 * 2/7 = 5 1/5 * 2/7 = 26/5 * 2/7= 52/35= 1 17/35
f) 0,6 : 2/3 = 6/10 : 2/3 = 3/5 * 3/2 = 9/10
g) 2 3/20 + 1,27 = 43/20 + 127/100 = 215/100 + 127/100 =342/100 = 3 42/100
h) 0,65 : 6 1/2 = 65/100 : 13/2= 13/20: 13/2 = 13/20 * 2/13= 1/10 * 1/1 = 1/10
i) 4,5 - 3/4 * 1/3= 4 1/2 - 3/4 * 1/3 = 4 1/2 - 1/4 * 1/1= 9/2 - 1/4 = 18/4 - 1/4=
= 17/4 = 4 1/4
j) ( 1 2/5 + 0,5) : 2 = ( 7/5 + 1/2) : 2 = ( 14/ 10 + 5/10) : 2 = 19/10 * 1/2= 19/20
k) 5/8 * 4,2 - 1/4 = 5/8 *2/5 - 1/4 = 1/8 * 2/1 - 1/4= 21/8 - 2/8 = 19/8 = 2 3/8
l) 4/7 * (0,2 + 1/4) = 4/7 * ( 1/5 + 1/4) = 4/7 * (4/20 + 5/20) = 4/7 * 9/20 =36/140 = 9/35
Liczę że pomogłam i czekam na naj :>
