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determina numarul necunoscut (2+2×2×2-2:2)×(20-2)=a-2:2

Răspuns :

(2+2*2*2-2:2)*(20-2)=a-2:2
(2+8-1)*18=a-1
9*18=a-1
162=a-1
a=163
(2+8-1)×18=a-1
(10-1)×18=a-1
9×18=a-1
162=a-1
a-1=162
162+1=163
a=163