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受欢迎的代数 >

a(x)= x/((x+2)),b(x)-2^{-x}

解答

a (x) = \frac{x}{( x + 2 )}, b (x) - 2^{- x}

解答

x = 0, x = - \frac{2 a - 1}{a}; a \neq = 0

求解步骤

a (x) = \frac{x}{( x + 2 )}

化简

\frac{x}{( x + 2 )} : \frac{x}{x + 2}

a (x) = \frac{x}{x + 2}

在两边乘以

x + 2

a x (x + 2) = x

解

a x (x + 2) = x : x = 0, x = - \frac{2 a - 1}{a}; a \neq = 0

x = 0, x = - \frac{2 a - 1}{a}; a \neq = 0

验证解

找到无定义的点（奇点）:

x = - 2

将不在定义域的点与解相综合:

x = 0, x = - \frac{2 a - 1}{a}; a \neq = 0

作图

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