zad 70 str 52 (matematyka z plusem kl 1)
a) 12- 2/7 - 7+13 3/7
b)-5,8+2,7-2,2+0,3
c)-5 1/8 + 1 1/12 + 2 7/12+1/8
d)-0,5-3/4+1 1/2-0.25
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12-2/7 - 7+13 3/7 =11 5/7 -20 3/7 = - 9 2/7
-5,8+2,7-2,2+0,3= -3,1 -2,2+0,3 = -5
-5 1/8 +1 1/12 + 27/12+1/8 = -5 +3 8/12 = -1 4/12
-0,5-3/4+1 1/2-0,25= -1,25 +1,25= 0