Răspuns:
ex.1
20%
ex.2
3/7+2/7=5/7
5/9-4/9=1/9
2/3×4/5=8/15
(3/5)^2=9/25
2/2:3/4=4/3
ex.3
a)
7/8+3/6=21+12/24=33/24( amplificam prima fractie cu 3 si a doua fractie cu 4 pt a stabili numitorul comun 24)
b)
5/3-4/9=15/9-4/9=11/9(amplificam cu 3 prima fractie)
c) 8/9×3/4=2/3(simplificam in diagonala 8 cu 4 si 3 cu 9)
d)(3/4)^3=27/64
