-1/4 j=2-3/4+1/2 j+3/2 j

解答

- \frac{1}{4} j = 2 - \frac{3}{4} + \frac{1}{2} j + \frac{3}{2} j

j = - \frac{5}{9}

十进制

j = - 0.55555 \dots

求解步骤

- \frac{1}{4} j = 2 - \frac{3}{4} + \frac{1}{2} j + \frac{3}{2} j

合并分式

2 - \frac{3}{4} : \frac{5}{4}

- \frac{1}{4} j = \frac{5}{4} + \frac{1}{2} j + \frac{3}{2} j

两边减去

\frac{1}{2} j + \frac{3}{2} j

- \frac{1}{4} j - (\frac{1}{2} j + \frac{3}{2} j) = \frac{5}{4} + \frac{1}{2} j + \frac{3}{2} j - (\frac{1}{2} j + \frac{3}{2} j)

化简

- \frac{9}{4} j = \frac{5}{4}

在两边乘以

4

- 9 j = 5

两边除以

- 9

j = - \frac{5}{9}

so l v e f or x, 10 x - 7 y = - 8

so l v e f or a, a = \frac{1}{2} h (a + b)

so l v e f or x, 2 x - 5 y = 0

so l v e f or x, y + 1 = \frac{4}{3} x

so l v e f or x, x - 2 y = 9