Zad 20. Oblicz:
a) -66 - 44 =
45 - 54 =
b) -9 -(-64) =
-111 - 333 =
c) 89 - (-211) =
-7,5 - (-2,5) =
Zad 21. Uzupełnij:
a) 6 - ....... = 9
-4 -........ = 1
b) -7 - ....... = -10
0 - ........ = 7
c) 89 - (-211)=
-7,5 - (-2,5) =
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