x(1-(1-0.2)*(1+0.3))=60

解答

x (1 - (1 - 0.2) \cdot (1 + 0.3)) = 60

x = - 1500

求解步骤

x (1 - (1 - 0.2) (1 + 0.3)) = 60

两边除以

- 0.04

x = - 1500

6 x - 6 = 2 x + 10

7 (x + 8) = 10 (x - 5) + 70

lo g_{2} (7) = x

so l v e f or f, f (x - 2) = 2 x^{2} - x + 5

8 (x - 9) = - 2 (x + 41)