展开 l(e^2(t-3)cos(t-3))

解答

展开

l (e^{2} (t - 3) cos (t - 3))

e^{2} lt cos (t - 3) - 3 e^{2} l cos (t - 3)

求解步骤

l (e^{2} (t - 3) cos (t - 3))

去除括号:

(a) = a

= l e^{2} (t - 3) cos (t - 3)

= e^{2} l cos (t - 3) (t - 3)

使用分配律:

a (b - c) = ab - a c

a = l e^{2} cos (t - 3), b = t, c = 3

= l e^{2} cos (t - 3) t - l e^{2} cos (t - 3) \cdot 3

= e^{2} lt cos (t - 3) - 3 e^{2} l cos (t - 3)

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

e x p an d \frac{( b + x ) ^{4}}{4}

e x p an d (x + 1)^{5} e^{3 x^{2}}

e x p an d, (5 a^{2} - 2 b + c^{3}) (3 x - 2 y - 5 z + 2)

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