化简 (2+7t)(8-5t)+2(5+t)(8.66)

解答

化简

(2 + 7 t) (8 - 5 t) + 2 (5 + t) (8.66)

- 35 t^{2} + 63.32 t + 102.6

求解步骤

(2 + 7 t) (8 - 5 t) + 2 (5 + t) (8.66)

化简

2 (5 + t) (8.66) : 17.32 (5 + t)

= (2 + 7 t) (8 - 5 t) + 17.32 (5 + t)

展开

(2 + 7 t) (8 - 5 t) : 16 + 46 t - 35 t^{2}

= 16 + 46 t - 35 t^{2} + 17.32 (5 + t)

展开

17.32 (5 + t) : 86.6 + 17.32 t

= 16 + 46 t - 35 t^{2} + 86.6 + 17.32 t

对同类项分组

= - 35 t^{2} + 46 t + 17.32 t + 16 + 86.6

e x p an d (y^{3} + 15 x y^{4} - 2 x) d x + (3 x y^{2} + 20 x^{2} y^{3}) d x

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

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

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

e x p an d \frac{a}{12} \cdot \frac{9}{10}