Question

Oblicz:
a) -2 1/5 + 3,3 =
b) 1 5/6 - 3 1/3 =
c) 4,3 - 7,5 =
d) -4,5 - 2 1/4 =
e) -3 1/6 - (-5 5/6) =
f) 7 1/3 + (-4 5/6) =
g) -5 4/7 + 7 =
h) 1,23 - 9 =
i) -6 - (-4 5/9) =

Answer 1

a)
 -2 1/5 + 3,3 =
= -2,2 + 3,3 = 1,1
b)
1 5/6 - 3 1/3 =
= 1 5/6 - 3 2/6 = 1 5/6 - 2 8/6 = -1 3/6 = -1 1/2
c)
4,3 - 7,5 =
= - 3,2
d)
-4,5 - 2 1/4 =
= -4,5 - 2,25 = -6,75
e)
-3 1/6 - (-5 5/6) =
= -3 1/6 + 5 5/6 = 2 4/6 = 2 2/3
f)
7 1/3 + (-4 5/6) =
= 7 2/6 - 4 5/6 = 6 8/6 - 4 5/6 = 2 3/6 = 2 1/2
g)
-5 4/7 + 7 = 1 3/7
h)
1,23 - 9 = -7,77
i)
-6 - (-4 5/9) = -6 + 4 5/9 = -1 4/9
musisz zapamietac, ze jezeli masz minus przed nawiasem, to wszystkie liczby w nawiasie zmieniaja znak