Question

aflati x €Q stiind ca 5x+1 supra = 1 intreg 1 supra 2

Answer 1

5x+1=1$\frac{1}{2}$<=> 5x+1=1*2+1 supra 2 =>5x+1=$\frac{3}{2}$<=>5x=$\frac{3}{2}$-1 ;aducem pe 1 la acelasi numitor cu 3/2 si obtinem :5x=3-2 supra 2 <=>5x=1/2 |:5=>x=1/2 *1/5 =>x=1/10
Deci, x este 1/10 si apartine lui Q.