Răspuns:
2.
a)20/100 • 75 = 15
b)12/100 • 50 = 6
c)35/100 • 60 = (35•6)/10 = (7•6)/2 = 21
d)36/100 • 225 = 9•9 = 81
e)75/100 • 312 = 3•78 = 234
f)504 : 4 = 126 (25% înseamnă sfert)
3.
a)37=x/2 =>x=74
b)87=x/10 =>x=870
c)98=7x/10 =>x=140
d)51=3x/25 =>x=25•17=425
e)57=3x/4 =>x=4•19=76
f)42=6x/25 =>x=7•25=175
