展开 (2(x+y)+3)/((x+y)^2)

解答

展开

\frac{2 ( x + y ) + 3}{( x + y ) ^{2}}

\frac{2 x + 2 y + 3}{x ^{2} + 2 x y + y ^{2}}

求解步骤

\frac{2 ( x + y ) + 3}{( x + y ) ^{2}}

(x + y)^{2} = x^{2} + 2 x y + y^{2}

= \frac{2 ( x + y ) + 3}{x ^{2} + 2 x y + y ^{2}}

乘开

2 (x + y) + 3 : 2 x + 2 y + 3

= \frac{2 x + 2 y + 3}{x ^{2} + 2 x y + y ^{2}}

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

e x p an d \frac{3 x}{( x - 2 ) ( x - 4 )}

e x p an d \frac{z ^{2} ( 1 + 2 z ) ^{3}}{6}

e x p an d cos (3 (9 0^{\circ} - c))

e x p an d (- 59) + (- 1)