Răspuns:
1. 2/3=x/9=> x= (2×9)/3= 18/3= 6
2. 25/100 × 52= 1/4 ×52= 13 km
3. Din proportie xy=20×1,5= 2×10×1,5=30
xy/10=30/10= 3
1.
2/3=x/9
x= 2×9/3 = 18/3= 6
2.
25%=25/100
25/100 × 52 = 25×52/100 = 1300/100= 13
3.
20/x= y/1,5
x × y= 20×1,5 = 30
x × y / 10= 30 /10 = 3
/- înseamnă supra
