= 66

75 . 48 = 25 . 3 . 3 . 16 = 25 . 3 2 . 16 = 5 . 3 . 4 = 60

90 . 6 , 4 = 9 . 64 = 9 . 64 = 3 . 8 = 24

45 . 80 = 9 . 5 . 5 . 16 = 9 . 5 2 . 16 = 3 . 5 . 4 = 60

2 , 5 . 14 , 4 = 25 . 1 , 44 = 25 . 1 , 44 = 5 . 1 , 2 = 6

a)\(\sqrt{75\cdot48}=\sqrt{25\cdot3\cdot48}=\sqrt{25\cdot144}=\sqrt{25}\cdot\sqrt{144}=5\cdot12=60\)

b) \(\sqrt{2,5\cdot14,4}=\sqrt{25\cdot144\cdot\frac{1}{100}}=\sqrt{25}\cdot\sqrt{144}\cdot\sqrt{\frac{1}{100}}=5\cdot12\cdot\frac{1}{10}=6\)