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受欢迎的代数 >

7/(x+3)= 4/12

解答

\frac{7}{x + 3} = \frac{4}{12}

解答

x = 18

求解步骤

\frac{7}{x + 3} = \frac{4}{12}

使用分式交叉相乘

84 = (x + 3) \cdot 4

交换两边

(x + 3) \cdot 4 = 84

两边除以

4

x + 3 = 21

将

3

到右边

x = 18

验证解

找到无定义的点（奇点）:

x = - 3

将不在定义域的点与解相综合:

x = 18

作图

流行的例子

(p+4)/3 =(13)/(p-6)

\frac{p + 4}{3} = \frac{13}{p - 6}

2x-(32)/(x^3)=0

2 x - \frac{32}{x ^{3}} = 0

solvefor r,θ=(3r+2)/(2r+3)

so l v e f or r, θ = \frac{3 r + 2}{2 r + 3}

solvefor 1/y =x+2,y

so l v e f or \frac{1}{y} = x + 2, y

5/(x+2)= 2/(x-1)

\frac{5}{x + 2} = \frac{2}{x - 1}