Number System and Simplification

BODMAS, fractions, decimals, square and cube roots.

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Q1 · Number System and Simplification · EASY
What is the value of: 72 ÷ 8 × 3 + 12 - 5?
Q2 · Number System and Simplification · EASY
Simplify: (3/4 + 2/5) × 20
Q3 · Number System and Simplification · MEDIUM
Find the value of: √(1296) + ∛(729)
Q4 · Number System and Simplification · MEDIUM
What is the value of: 0.8 × 0.8 + 0.6 × 0.6 - 2 × 0.8 × 0.6?
Q5 · Number System and Simplification · HARD
If x = 2 + √3, then what is the value of (x² + 1/x²)?