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afla numarul necunoscut 35×5-54:a×4=139

Răspuns :

35x5-54:ax4=139
175-54:ax4=139
175-139=54:ax4
54:ax4=36
54:a=36:4
54:a=9
a=54:6
a=9


60-10:(37-4×a)=50

10:(37-4xa)=60-50
10:(37-4xa)=10
37-4xa=10:10
37-4xa=1
4xa=37-1
4xa=36
a=36:4
a=9