pai produsul mezilor e egal cu cel al extremilor adica:
a) x/5=20/25
x•25=20•5
x=100/25
x=4
b) 8/x=4/3
8•3=4•x
x=24/4
x=6
c) 3/7=x/28
7•x=28•3
x=84/7
x=12
d) 15/18=5/x
15•x=5•18
x=90/15
x=6
e) x/6=2=>x=2•6=12
f)x/3=7=>x=3•7=21
g)9/x=3=>x=9:3=3
h)6/1=4x=>6x=4=>x=4:6
i)8/x=4/3=>24=4x=>x=24:4=6
j)10/14=x/7=>14•x=10•7=>14x=70=>x=70:14=5
