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Bebemic2006
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Afla numarul necunoscut: a-42:7+2=;  28+72:b+12=48;  47-56:c-11=29;  (56+16:2):8+d =18.

Răspuns :

CarMina03
a-42:7+2=7
a-6+2=7
a-6=7-2
a-6=5
a=5+6
a=11



28+72:b+12=4828+72:b=48-12
28+72:b=36
72:b=36-28
72:b=8
b=72:8
b=9



47-56:c-11=29

47-56:c=29+11
47-56:c=40
56:c=47-40
56:c=7
c=56:7
c=8


(56+16:2):8+d =18
(56+8):8+d =18
64:8+d =18
8+d =18

d=18-8

d=10

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