The radii of curvature of the faces of a double

386.99 + 397.99 + ? - 232.02 = 35.02 × 31.99

(9/20 of 3998.93) - √2499.57 + (17.87% of 1199.67) = ?

? = 28.04² ÷ (4.01⁵ + 9.89 × 20.20) + 84.56% of (198.76 × 30.03)

24.75% of 639.87 + (299.98 ÷ 2.5) = ?² + 24.18

? = 782.24 + 1243.97 – 19.99²  

`(sqrt(960.87)xx9.932+sqrt(629.998)xx26.385)/(sqrt(1028.902)xx4.977)=?`

?^2/3 = 33.33% of 107.99 + 45.45

31.98% of 224.99 = 24.98% of ? + 9.91% of 499.99

[{(√785) % of 449.85}/(35.89 × 7.14 + 849.89 ÷ 5.12 + 199.78% of 41.09)] = ( 1/? ) 

18.22 × 7.99 + 156.15 = ?