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受欢迎的代数 >

(0.2x+5)/(3.5x-3)= 2/5

解答

\frac{0.2 x + 5}{3.5 x - 3} = \frac{2}{5}

解答

x = \frac{31}{6}

+1

十进制

x = 5.16666 \dots

求解步骤

\frac{0.2 x + 5}{3.5 x - 3} = \frac{2}{5}

使用分式交叉相乘

x + 25 = 7 x - 6

将

25

到右边

x = 7 x - 31

将

7 x

para o lado esquerdo

- 6 x = - 31

两边除以

- 6

x = \frac{31}{6}

验证解

找到无定义的点（奇点）:

x = \frac{6}{7}

将不在定义域的点与解相综合:

x = \frac{31}{6}

作图

流行的例子

((19-x))/((42-x))=0.12

\frac{( 19 - x )}{( 42 - x )} = 0.12

solvefor x,z=y^2+2f(1/x+log_{10}(y))

so l v e f or x, z = y^{2} + 2 f (\frac{1}{x} + lo g_{10} (y))

solvefor a,(p+4)-2 p/a =8

so l v e f or a, (p + 4) - 2 \frac{p}{a} = 8

(12)/((0.1+x)-20)=(12)/((0.2+x))

\frac{12}{( 0.1 + x ) - 20} = \frac{12}{( 0.2 + x )}

x^2+1/(x^2)+5x-5/x+4=0

x^{2} + \frac{1}{x ^{2}} + 5 x - \frac{5}{x} + 4 = 0