Which theory is generally included under micro

45.22% of (71.9 x 5.01) + 69.97 =? 

Find the value of ‘x’ in the given expression:[144 + {2 × (13 ÷ 0.5 × 6 – 3) ÷ 4} – 6.5] = x

√2023.85 + (24.77% of 1999.73) - (3/8 of 799.91) = ?

(15.99)² + 219.98% of 20.01 = ?² × 75.01%

390.11 ÷ 12.98 × 5.14 – 119.9 = √? 

564.932 + 849.029 – 425.08 = 612.095 + ?

²√574 + 19.956% of 1449.978 = ?% of 628.08

What approximate value will come in place of question (?) in the following given expression? You are not expected to  calculate the exact value.

16.99% of 399.99 ÷ 17.17 = ? ÷ 15.15