Create and solve two problems involving addition, subtraction, multiplication and division of radicals .

Problem 1:

Solve the expression:

√(25) + √(9) - √(4) × √(16) ÷ √(81)

Solution:
√(25) + √(9) - √(4) × √(16) ÷ √(81)
= 5 + 3 - 2 × 4 ÷ 9
= 5 + 3 - 8/9
= 8 - 8/9
= 72/9 - 8/9
= 64/9
= 7 1/9

Problem 2:
Solve the expression:

√(16) × (√(25) + √(9)) - √(81) ÷ √(4)

Solution:
√(16) × (√(25) + √(9)) - √(81) ÷ √(4)
= 4 × (5 + 3) - 9 ÷ 2
= 4 × 8 - 9 ÷ 2
= 32 - 9 ÷ 2
= 32 - 4.5
= 27.5