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



Răspuns :

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