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9000-(6400-Y: 5:2) = 2604​

Răspuns :

Răspuns:

[tex]\boldsymbol{ \red{40}}[/tex]

Metoda mersului invers:

9000 - (6400 - Y:5:2) = 2604​

6400 - Y:5:2 = 9000 - 2604​

6400 - Y:5:2 = 6396

Y:5:2 = 6400 - 6396

Y:5:2 = 4

Y:5 = 4·2

Y:5 = 8

Y = 8·5

Y = 40

Verificare: 9000 - (6400 - 40:5:2) = 9000 - (6400 - 8:2) = 9000 - (6400 - 4) = 9000 - 6396 = 2604 (corect!)