Question

Determina numerele naturale x pentru care fractiile date sunt echivalente cu:

Answer 1

a)x/40=2/5=>x=2*40/5=80/5=16
b)6/x=2/5=>x=6*5/2=>x=30/2=>x=15
c)$\frac{3+x}{10}$=>x+3=$\frac{10*2}{5}$=>x+3=$\frac{20}{5}$=>x+3=>x=4-3=>x=1

Answer 2

a) x/40=2/5 ⇒ 5x=2x40; 5x=80; x=80:5; x=16
b)  6/x=2/5  ⇒  2x=6x5; 2x=30; x=30:2; x=15
c) (x+3)/10=2/5 ⇒ 5(x+3)=2x10; 5x+15=20; 5x=20-15; x=5:5⇒x=1