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afla numarul necunoscut;(162+12_164)·a=100

Răspuns :

(162 + 12 - 164) × a = 100
(174 - 164) × a = 100
10 × a = 100
a = [tex] \frac{100}{10} [/tex]
a = 10
(162+12-164)•a=100
(174-164)•a=100
10•a=100
a=100:10
a=10