x+2y/2y=7/4 => 4*(x+2y)=7*2y => 4x+8y=14y => 4x=6y => 2x=3y => x=3y/2
=> x/y=3y/2y=3/2
2x+3y/2x+4y=13/16 <=> 16(2x+3y)=13(2x+4y) <=> 32x+48y= 26x+52y => 32x-26x=52y-48y => 6x=4y => 3x=2y => x=2y/3 =>x/y=2y/3y=2/3
x+y/x-y=2 <=> x+y=2(x-y) <=> x+y=2x-2y <=> y+2y=2x-x <=> 3y=x <=> x/y=3y/y=3
Am folosit / pt linia de fractie
