(5-2x)/5+(x-4)/(10)= 9/10

解答

\frac{5 - 2 x}{5} + \frac{x - 4}{10} = \frac{9}{10}

x = - 1

求解步骤

\frac{5 - 2 x}{5} + \frac{x - 4}{10} = \frac{9}{10}

乘以最小公倍数

2 (- 2 x + 5) + x - 4 = 9

展开

2 (- 2 x + 5) + x - 4 : - 3 x + 6

- 3 x + 6 = 9

将

6

到右边

- 3 x = 3

两边除以

- 3

x = - 1

8 x - 2 (x - 1) - 4 = 10 - 4 (3 - x) + x

m^{2} + 7 mn + 2 m + 14 n

x^{2} + 27 = 0

72 x^{3} z^{3}

x^{2} - 9 x^{2} y^{2}