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afla nr necunoscut (36:a +63:9):2=8

Răspuns :

(36/a+7)=8*2=16
36/a=16-7=9
a=36*9
a=324
(36/a+7)X1/2=8
36+7a/a x 1/2=8
36+7a/2a=8
36+7a/2a=8
36+7a=16a
7a-16a=-36
-9a=-36
a=4