展开 (4(1-3x))/((3x+1)^3)

解答

展开

\frac{4 ( 1 - 3 x )}{( 3 x + 1 ) ^{3}}

\frac{4 - 12 x}{27 x ^{3} + 27 x ^{2} + 9 x + 1}

求解步骤

\frac{4 ( 1 - 3 x )}{( 3 x + 1 ) ^{3}}

(3 x + 1)^{3} = 27 x^{3} + 27 x^{2} + 9 x + 1

= \frac{4 ( - 3 x + 1 )}{27 x ^{3} + 27 x ^{2} + 9 x + 1}

乘开

4 (1 - 3 x) : 4 - 12 x

= \frac{4 - 12 x}{27 x ^{3} + 27 x ^{2} + 9 x + 1}

e x p an d (4 t - 8) d t

e x p an d \frac{y ^{3}}{( 1 - x ) ^{2} + y ^{2}}

e x p an d \frac{e ^{- x}}{( x ( x + 3 ) ( x - 1 ) )}

e x p an d \frac{4 ^{k} k ^{2}}{( k + 1 ) ( k + 2 )}

e x p an d \frac{26 ( 7 x - y ) ^{2}}{25}