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cum se rezolva xy+4y=5×(x+8y)

Cum Se Rezolva Xy4y5x8y class=

Răspuns :

xy+4y=5(x+8y)
10x+y+4y=5x+40y
5x=35y /:5
x=7y
daca xy-numar
=> x,y - cifre
=> y=1 => x=7*1 => x=7