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daca a-b=72 si (a-c)-(b+c)=18,determinati numarul c

Răspuns :

0000000
a-b=72
(a-c)-(b+c)=18
____________
c=?
____________
(a-c)-(b+c)=18
Desfacem parantezele:
a-c-b-c=18
(a-b)-2c=18
72-2c=18
2c=54
c=27
Deva
a-b=72
(a-c)-(b+c)=18
a-c-b-c=18,a-b-2c=18,72-2c=18,54=2c,c=27

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