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1)2/a=b/5     a·b= ???
2)x/y=2/5  calculati : 3x+2y/5y-10x  ???


Răspuns :

2/a=b/5 a·b= ???inmultesti pe diagonala
ab=2*5
a*b=10

x/y=2/5
5x=2y
x=2y/5

3*2y/5+2y / 5y-10*2y/5 = 
6y/5+2y supra 5y-20y/5=
6y+10y/5  supra 25y-20y/5=
16y/5 pe 5y/5 = 
16y/5:5/5y=
16/5