s=x*y(z-2)
677/8
4x^2+11x-15
m*2+4m+4-n*2
132.1-1.99
2x^2+13x+15
(4x²)²
(1.39449 x 10-5) / 2.303 (log 1.67 x 10-3 – log 2.00 x 10-6)
252+168-99/3*6
1.39449 x 10-5 = 2.303 x 4D (log 1.67 x 10-3 – log 2.00 x 10-6)
D = ?