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Buna.afla Numar ul necunoscut.35×5-54:a×4=139

Răspuns :

35x5-54:ax4=139
175-54:ax4=139
54:ax4=175-139
54:ax4=36
54:a=36:4
54:a=9
a=54:9
a=6
proba: 35x5-54:6x4=175-9x4=175-36=139
35x5-54:ax4=139
175-54:ax4=139
54:ax4=175-139
54:ax4=36
54:a=36:4
54:a=9
a=54:9
a=6