Răspuns:
Explicație pas cu pas:
a) x/y=3/4
(2x/y+3)/(4x/y+1)=(2×3/4+3)/(4×3/4+1)=(6+12)/(12+4)=18/16=9/8
b) x/y=7/9
(x/y+2)/(3x/y+1)=(7/9+2)/(3×7/9+1)=(7+18)/(21+9)=25/30=5/6
c) x/y=2/5
(7x/y-2)/(x/y+4)=(7×2/5-2)(2/5+4)=(14-10)/(2+20)=4/22=2/11
d) x/y=3/11
(10x/y-1)/(x/y+1)=(10×3/11-1)/(3/11+1)=(30-11)/(3+11)=19/14
