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{-5/6-[-1/18)-(+7/12)]}÷(-7/72

Răspuns :

[-5/6 - (-1/18 - 7/12)] · (-72/7) =
In paranteza rotunda calculam numitorul comun :
18=2·3²
12=2²·3
_______
c.m.m.m.c.=2²·3²=36
[(-5/6 - (-2-21)/36] · (-72/7) = 
(-5/6 + 23/36) · (-72/7) =
(-5·6 + 23)/36 · (-72/7) =
(-7/36) · (-72/7) = 
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