solvefor u, u/p+u/q =m

解答

求解

u, \frac{u}{p} + \frac{u}{q} = m

u = \frac{m pq}{q + p}; pq \neq = 0, q + p \neq = 0

求解步骤

\frac{u}{p} + \frac{u}{q} = m

乘以最小公倍数

u q + u p = m pq; pq \neq = 0

分解

u q + u p : u (q + p)

u (q + p) = m pq; pq \neq = 0

两边除以

q + p; pq \neq = 0, q + p \neq = 0

u = \frac{m pq}{q + p}; pq \neq = 0, q + p \neq = 0

so l v e f or x, 3 x + 3 y = 9

so l v e f or y, x = - 3 y + 8

2 \frac{1}{4} + y = 5 \frac{3}{4}

- \frac{a}{0.4} + 1.5 = 2.75

39 = \frac{3}{11} z + 18