8.2= x/9

解答

8.2 = \frac{x}{9}

x = 73.8

求解步骤

8.2 = \frac{x}{9}

交换两边

\frac{x}{9} = 8.2

在两边乘以

9

x = 73.8

\frac{1}{2} (x - 3) + x = 17 + 3 (4 - x)

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

24 = 4 + 10 x

12 x - 9 - 10 x + 3 - 8 x = x - 9 + 3 x + 10 - 10 x

so l v e f or y, y - 2 x y = 15