展开 (4(x+5)(x+1))/((x+3)(x-3))

解答

展开

\frac{4 ( x + 5 ) ( x + 1 )}{( x + 3 ) ( x - 3 )}

\frac{4 x ^{2} + 24 x + 20}{x ^{2} - 9}

求解步骤

\frac{4 ( x + 5 ) ( x + 1 )}{( x + 3 ) ( x - 3 )}

乘开

(x + 3) (x - 3) : x^{2} - 9

= \frac{4 ( x + 5 ) ( x + 1 )}{x ^{2} - 9}

乘开

4 (x + 5) (x + 1) : 4 x^{2} + 24 x + 20

= \frac{4 x ^{2} + 24 x + 20}{x ^{2} - 9}

e x p an d 6 (15)

e x p an d (3 x + 4 y - 2 z = 5,) - (3 x - 9 y + 8 z = 9)

e x p an d e^{2 t - 8} h (t - 4)

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

e x p an d A (2, - 3) B (5, 1)