0.12(2x-5)+3x=81

解答

0.12 (2 x - 5) + 3 x = 81

x = \frac{680}{27}

十进制

x = 25.18518 \dots

求解步骤

0.12 (2 x - 5) + 3 x = 81

在两边乘以

100

12 (2 x - 5) + 300 x = 8100

展开

12 (2 x - 5) + 300 x : 324 x - 60

324 x - 60 = 8100

将

60

到右边

324 x = 8160

两边除以

324

x = \frac{680}{27}

so l v e f or y, 2 y + 10 y = x

so l v e f or x, 2 x + y = 24.5

so l v e f or x, 3 y - 2 x + 12 = 0

r = \frac{( 2 ^{n + 4} + 2 ( 2 ^{n} ) )}{3 ( 2 ^{n} )}

- 9 y - 8 + 3 y + 7 = - 7 y + 8 y - 5 y + 9