Zadanie 4
a) 2/5 + 0,77 = 0,4 + 0,77 = 1,17
b) 15,4 + 3 1/3 = 15 4/10 + 3 1/3 = 15 12/30 + 3 10/30 = 18 22/30 = 18 11/15
c) 8 3/4 + 1,125 = 8,750 + 1,125 = 9,875
d) 1,75 - 5/6 = 1 3/4 - 5/6 = 1 9/12 - 10/12 = 11/12
e) 3 1/3 - 2,25 = 3 1/3 - 2 1/4 = 3 4/12 - 2 3/12 = 1 1/12
f) 6,8 - 5 1/4 = 6,8 - 5,25 = 1,55
g) 6,4 - 5/8 = 6,4 - 0,625 = 5,775
h) 2/15 * 0,75 = 2/15 * 3/4 = 1/5 * 1/2 = 1/10
i) 1 3/7 * 0,056 = 10/7 * 56/1000 = 1/1 * 8/100 = 8/100 = 0,08
j) 2,4 : 1 3/5 = 24/10 * 8/5 = 24/5 * 4/5 = 96/25 = 3 21/25
k) 3 3/4 : 0,05 = 15/4 : 5/100 = 15/4 * 100/5 = 3/1 * 25/1 = 75/1 = 75
l) 2 5/6 : 3,4 = 17/6 : 34/10 = 17/6 * 10/34 = 1/3 * 5/2 = 5/6
Zadanie 6
a) 4,67 - ( 3 5/6 - 1/3 ) = 4,67 - ( 3 5/6 - 2/6 ) = 4,67 - 3 3/6 = 4,67 - 3,5 = 1,17
b) 2,8 + 1 1/3 * 0,9 = 28/10 + 4/3 * 9/10 = 28/10 + 2/1 * 3/5 = 28/10 + 6/5 = 28/10 + 1 1/5 = 28/10 + 1 2/10 = 28/10 + 12/10 = 40/10 = 4
c) 3,6 : 3/5 - 1 1/5 = 36/10 * 5/3 - 1 1/5 = 12/2 * 1/1 * 5/3 = 12/2 * 5/3 = 4/2 * 5/1 = 10
d) 0,2^2 * (1,6 - 2/5) = 0,04 * (1,6 - 0,4) = 0,04 * 1,2 = 0,048
e) 2,8 * 1 1/4 - 2/3 * 0,75 = 28/10 * 5/4 - 2/3 * 3/4 = 7/2 * 1/1 - 1/1 * 1/2 = 7/2 - 1/2 = 6/2 = 3
f) (4,5 - 1,1) * 2 * 3/4 - 1 = 3,4 * 2 * 3/4 - 1 = 6,8 * 3/4 - 1 = 68/10 * 3/4 - 1 = 17/10 * 3/1 = 51/10 = 5,1
