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CINE MA AJUTA:
(84:a)*9-72:4=36


Răspuns :

(84:a)*9-72=36*4
(84:a)*9-72=144
(84:a)*9=144+72
(84:a)*9=216
(84:a)=216:9
(84:a)=24
a=84*24
a=2016

Răspuns

(84:a)*9-72=X

X:4=36

X=36*4

X=144

(84:a)*9-72=144

(84:a)*9=X

X-72=144

X=144+72

X=216

(84:a)*9=216

(84:a)=X

X*9=216

X=216:9

X=24

84:a=24

a=84:24

a=3,5



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