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受欢迎的代数 >

2/(3x+5x)=4-x

解答

\frac{2}{3 x + 5 x} = 4 - x

解答

x = \frac{4 - 15}{2}, x = \frac{4 + 15}{2}

+1

十进制

x = 0.06350 \dots, x = 3.93649 \dots

求解步骤

\frac{2}{3 x + 5 x} = 4 - x

化简

\frac{2}{3 x + 5 x} : \frac{1}{4 x}

\frac{1}{4 x} = 4 - x

在两边乘以

x

\frac{1}{4} = 4 x - x^{2}

解

\frac{1}{4} = 4 x - x^{2} : x = \frac{4 - 15}{2}, x = \frac{4 + 15}{2}

x = \frac{4 - 15}{2}, x = \frac{4 + 15}{2}

验证解

找到无定义的点（奇点）:

x = 0

将不在定义域的点与解相综合:

x = \frac{4 - 15}{2}, x = \frac{4 + 15}{2}

作图

流行的例子

solvefor w,Cd=(12ds)/w

so l v e f or w, C d = \frac{12 d s}{w}

((8+x))/((14+x))=0.8

\frac{( 8 + x )}{( 14 + x )} = 0.8

x = \frac{- 8 x - 15}{x}

(8x)/(28x)= x/2

\frac{8 x}{28 x} = \frac{x}{2}

\frac{2 x - 1}{x + 3} = 0