a^{-m}= 1/(a^m)

解答

a^{- m} = \frac{1}{a ^{m}}

对所有 a 为真

求解步骤

a^{- m} = \frac{1}{a ^{m}}

整理后得

\frac{1}{a ^{m}} = \frac{1}{a ^{m}}

两边减去

\frac{1}{a ^{m}}

\frac{1}{a ^{m}} - \frac{1}{a ^{m}} = \frac{1}{a ^{m}} - \frac{1}{a ^{m}}

化简

0 = 0

两侧相等

对所有 a 为真

\frac{3 x + 9}{2} = \frac{2}{3 x + 5}

\frac{31}{4 x} = 1300000

\frac{4 x ^{2}}{( x - 3 )} = \frac{4 x ^{2}}{( x - 3 )}

so l v e f or x, y^{2} = \frac{x ^{2}}{3 - x}

\frac{x}{x - 2} - \frac{3}{x + 2} = \frac{2 x ^{2} + x + 6}{x ^{2} - 4}