r = radical
/ = fracție
ex 3
b) r 16/25= r (4/5)² = 4/5
c) r 36/49= r ( 6/7)² = 6/7
d) r 1/100= r ( 1/10)²= 1/10
e) r 121/81= r ( 11/9)²= 11/9
f) r 225/144= r ( 15/ 12)²= 15/12
ex 4
b) r 2×1/4= r 4×2+1/4 = r 9/4 = 3/2
c) r 2×14/25= r 2×25+14/25= r 64/25= 8/5
d) r 1+11/25= r 1×25+11/25 = r 36/25= 6/5
e) r 3×6/25= r 3×25+6/25= r 81/25= 9/5
f) r 4×13/36= r 4×36+13/36= r 157/36= 157/6
ex 5
b) r 0,25= r (0,5)²= 0,5
c) r 0,81= r ( 0,9)²= 0,9
d) r 2,56= r ( 1,6)² = 1,6
e) r 6,76= r ( 2,6)²=2,6
f) r 0,0225= r (0,15)²= 0,15
