a² + b² - 2ab = (a - b)² = (4.75 - 75)² = 4² = 16

.75% of 8000 = 60

.35% of 3200 = 11.2

∴ 60 + 11.2 = 356/100 x ?

∴ ? = 71.2x100/356 = 20%

25% of 7140/17x5x3 = 25% op 28 = 7

? = 53856/88x36 = 17

2 ^7.2 x (2²)^1.4 ÷ (2³)³ = 272 x 2 2.8 ÷ 29 = 2^{7.2 + 2.8-9} = 2¹ = 2

20 2/3

840 ÷ 12 x 6 + 820 ÷ 4 = 70 x 6 + 205 = 420 + 205 = 625

2^1.2 x 2⁷ x 2⁸ x 2^2.6 = 2^2x? 

1.2 x 7 + 8 + 2.6 = 2 x ?

11.6 = 2 x ?                  ∴ ? = 5.8

[(168)² ÷ 56 x 21] ÷ 42

= [28224 ÷ 56 x 21] ÷ 42

= [504 x 21] ÷ 42 = 10584 ÷ 42 = 252

∴ (?) = (252)² = 63504

(44)³ + (33)³ = 85184 + 35937 = 121121