Question

Calculați -3+{[-(3/10-0,7)+(-7/5-6)]-(4/5-2)]

Answer 1

......... presupun ca acolada se inchide la final .....

Calculam parantezele rotunde

3/10 - 0,7 = 3/10 -7/10 = -4/10 = - 2/5

-7/5 -6/1 = -7/5 - 30/5 = - 37/5

4/5 - 2/1  = 4/5 - 10/5 = -6/10 = - 3/5

Exercitiul devine

-3 + { [ - ( -2/5 ) + ( - 37/5 ) ] - ( - 3/5) } = - 3 + [  (2/5 - 37/5) +3/5 ] =

= - 3 + ( - 35/5 + 3/5 )  = - 3/1  - 32/5 = -15/5 -32/5 = -47/5