Răspuns:
Explicație pas cu pas:
a) 2/5 ×2.1/2 =2/5×5/2 =10/10 =1
b) 1/12×1.1/5 =5/12×6/5 =5×6/12/5 =30/60=1/2 =0.5
d) 2.1/7 ×2.4/5 =15/7×14/5 =15×14/7×5 =6
e) 4.1/5 ×2.1/7 =21/5×15/7 =21×15/5×7 =9
