Explicație pas cu pas:
2)
a) 3+2/5=15/5+2/5=17/5
b) 5-3/4=20/4-3/4=17/4
c) 3/2+3/8=24/16+6/16=30/16
d) 5/2+4×0,25=5/2+1=5/2+2/2=7/2
e) 3/4-20=3/4-80/4=-77/4
f) nu știu
