展开 ((46-x)(33-x))/((39-x)^2)

解答

展开

\frac{( 46 - x ) ( 33 - x )}{( 39 - x ) ^{2}}

\frac{1518 - 79 x + x ^{2}}{1521 - 78 x + x ^{2}}

求解步骤

\frac{( 46 - x ) ( 33 - x )}{( 39 - x ) ^{2}}

(39 - x)^{2} = 1521 - 78 x + x^{2}

= \frac{( - x + 46 ) ( - x + 33 )}{1521 - 78 x + x ^{2}}

乘开

(46 - x) (33 - x) : 1518 - 79 x + x^{2}

= \frac{1518 - 79 x + x ^{2}}{1521 - 78 x + x ^{2}}

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

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

e x p an d \frac{x ^{2} ( 8 y ^{3} + 3 x ) ^{2}}{16}

e x p an d \frac{1}{( s ^{2} + a ^{2} ) \cdot ( s ^{2} + b ^{2} )}

\frac{d ^{2}}{d y ^{2}} ((f (x)) (x (y - sin (y))))