Răspuns:
dam numitor comun
Explicație pas cu pas:
a) 1/3+1/2=(2×1)/(3×2)+(3×1)/(2×3)= 2/6+3/6=5/6
b) 1/8+1/2=1/8+4/8=5/8
c) 1/6+1/4=(1×2)/12+(3×1)/12)=2/12+3/12=5/12
d) 1/4+5/8=(2×1)/8+5/8=(2+5)/8=7/8
e) 1/3+1/4=4/12+3/12=7/12
f) 1/4+1/8=2/8+1/8=3/8
g) 5/6+7/4=10/12+21/12=31/12
h) 1/9+5/12=(1×4)/36+(5×3)/36=(4+15)/36=19/36
i) 1/12+7/6=1/12+14/12=15/12
j) 5/18+7/12=(5×2)/36+(7×3)/36=10/36+21/36=31/36
k) 2/15+7/20=(2×4)/60+(7×3)/60=8/60+21/60=29/60
l) 5/14+6/7= 5/14+12/14=17/14
