ex1)1/5*2/3=2/15
4/7*5/3=20/21
5/9*2/7=10/63
5*3/4=15/4
2/5*3=6/5
4/3*1/4=4/12=1/3
5/2*4/5=2
ex2)
a) 4/5*15/8=60/40=3/2(simplifici cu 20)
b)7/10*20/21=140/210=14/21=2/3
c)32/48*16/32=("tai pe 32 din diagonale)=16/48=4/12=1/3
d)11/12*24/33=264/396= 66/99=2/3
e)33/44*77/88*55/22=139755/85184
f)1313/3131*31/13=40703/40703=1