Răspuns :
Explicație pas cu pas:
a) 4-1 1/2= 4-(1×2+1)/2=4-3=2=8/2-3/2=5/2
b) 1 5/12 + 1 5/6 - 1 2/3 =
= (1×12+5)/12+(1×6+5)/6-(1×3+2)/3
=17/12+11/6-5/3 = 17/12+22/12-20/12
=(17+22-20)/12 =19/12
c) 1 7/15-4/5-1/3 = (1×15+7)/15-12/15-5/15
= (22-12-5)/15 =5/15=1/3