展开 (A(x)B(y))/((x+y)^2)

解答

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\frac{A ( x ) B ( y )}{( x + y ) ^{2}}

\frac{A B x y}{x ^{2} + 2 x y + y ^{2}}

求解步骤

\frac{A ( x ) B ( y )}{( x + y ) ^{2}}

去除括号:

(a) = a

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

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

= \frac{A B x y}{x ^{2} + 2 x y + y ^{2}}

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

s im pl i f y (x - 5)^{2} (x - 5 + 2 i) (x + i)

s im pl i f y (2 p + q) (2 p - q)

e x p an d A (- 14, 11) B (10, - 9) C (- 13, - 4)

s im pl i f y 3 (1 - x^{2} - \frac{x ^{2}}{( 1 - x ^{2} ) ^{\frac{1}{2}}})