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受欢迎的代数 >

0.2=(x^2)/(25-x)

解答

0.2 = \frac{x ^{2}}{25 - x}

解答

x = \frac{- 1 + 501}{10}, x = - \frac{1 + 501}{10}

+1

十进制

x = 2.13830 \dots, x = - 2.33830 \dots

求解步骤

0.2 = \frac{x ^{2}}{25 - x}

在两边乘以

25 - x

0.2 (25 - x) = x^{2}

解

0.2 (25 - x) = x^{2} : x = \frac{- 1 + 501}{10}, x = - \frac{1 + 501}{10}

x = \frac{- 1 + 501}{10}, x = - \frac{1 + 501}{10}

验证解

找到无定义的点（奇点）:

x = 25

将不在定义域的点与解相综合:

x = \frac{- 1 + 501}{10}, x = - \frac{1 + 501}{10}

作图

流行的例子

solvefor L,A= r/(2L)

so l v e f or L, A = \frac{r}{2 L}

solvefor x, 4/x-y=-1

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

\frac{2}{x} = \frac{1}{8 x} + 3

4/x =(23)/(8x)+3

\frac{4}{x} = \frac{23}{8 x} + 3

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

\frac{4}{x + 3} = \frac{3}{x - 2}