展开 (P(x)+q(x))left(q(x)-R(x))

解答

展开

(P (x) + q (x)) l e f t (q (x) - R (x))

e lP x^{2} q f t - e lP x^{2} f tR + e l x^{2} q^{2} f t - e l x^{2} q f tR

求解步骤

(P (x) + q (x)) l e f t (q (x) - R (x))

= e l f t (P (x) + (x) q) ((x) q - (x) R)

乘开

(P (x) + q (x)) (q (x) - R (x)) : P x^{2} q - P x^{2} R + x^{2} q^{2} - x^{2} qR

= l e f t (P x^{2} q - P x^{2} R + x^{2} q^{2} - x^{2} qR)

乘开

l e f t (P x^{2} q - P x^{2} R + x^{2} q^{2} - x^{2} qR) : e lP x^{2} q f t - e lP x^{2} f tR + e l x^{2} q^{2} f t - e l x^{2} q f tR

= e lP x^{2} q f t - e lP x^{2} f tR + e l x^{2} q^{2} f t - e l x^{2} q f tR

e x p an d \frac{6 ( x - 8 )}{7 ( 2 x - 5 )}

s im pl i f y (z^{2} + i)^{2}

e x p an d - \frac{6 ( - 3 x ^{2} + 5 )}{( 3 x ^{2} + 5 ) ^{2}}

e x p an d (sin (\frac{3 t}{2}) + cos (\frac{3 t}{2}))^{2}

e x p an d - ln (sin (x)) cos (x) + (- x - cot (x)) sin (x)