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受欢迎的代数 >

-f(a)=(4x-1)/(7x+4)

解答

- f (a) = \frac{4 x - 1}{7 x + 4}

解答

x = - \frac{- 1 + 4 f ( a )}{4 + 7 f ( a )}; \neq = 对所有 a 为真

求解步骤

- f (a) = \frac{4 x - 1}{7 x + 4}

在两边乘以

7 x + 4

- f (a) (7 x + 4) = 4 x - 1

展开

- f (a) (7 x + 4) : - 7 x f (a) - 4 f (a)

- 7 x f (a) - 4 f (a) = 4 x - 1

将

4 f (a)

到右边

- 7 x f (a) = 4 x - 1 + 4 f (a)

将

4 x

para o lado esquerdo

- 7 x f (a) - 4 x = - 1 + 4 f (a)

分解

- 7 x f (a) - 4 x : - x (7 f (a) + 4)

- x (7 f (a) + 4) = - 1 + 4 f (a)

两边除以

- (7 f (a) + 4); \neq =

对所有

a

为真

x = - \frac{- 1 + 4 f ( a )}{4 + 7 f ( a )}; \neq = 对所有 a 为真

作图

流行的例子

e^{- 2} + 1 = 0

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

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

\frac{- 3 k + 18}{k} = 0

(x-3)/2 = 8/(x+3)

\frac{x - 3}{2} = \frac{8}{x + 3}

solvefor x,3=(x+y)/(x-y)

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