sqrt(21)=sqrt(7)*sqrt(3)

解答

21 = 7 \cdot 3

真

求解步骤

21 = 73

化简

73 : 21

21 = 21

两侧相等

真

x = \frac{x}{5} + \frac{x}{3} + 3 (\frac{x}{3} - \frac{x}{5}) + 1

13 - 2 x = 6 - 2 x

10 - 9 x = 4 (x - 4)

(11.213 - 6.073) \cdot 550 = (9.5 - 6.073) \cdot x

- 32 x + 64 = 0