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Afla numărul necunoscut: (36:a+63:9):2=8

Răspuns :

(36:a+63:9)=8x2
36:a+63:9=16
36:a+7=16
36:a=16-7
36:a=9
A=9x36
A=324
(36:a+63:9):2=8
(36:a+7):2=8
(36:a+7)=8x2
36:a+7=16
36:a=16-7
36:a=9
a=36:9
a=4