Răspuns:
Explicație pas cu pas:
a. 1/8+1/8x4=1/8+1/2=(1+4)/8=5/8
b. 1/6+1/6÷1/3=1/6+1/6x3/1=1/6+1/2=(3+1)/6=4/6=2/3
d. 1si1/3x2si1/2+6=4/3x5/2+6=10/3+6=(10+18)/3=28/3
e. 2si1/7x1si1/5-1/21÷1/3=15/7x6/5-1/21x3/1=(3x6)/7-1/7=18/7-1/7=(18-1)/7=17/7
