展开 (-3ab^3)^2

解答

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(- 3 a b^{3})^{2}

9 a^{2} b^{6}

求解步骤

(- 3 a b^{3})^{2}

使用指数法则:

(- a)^{n} = a^{n},

若

n

是偶数

(- 3 a b^{3})^{2} = (3 a b^{3})^{2}

= (3 a b^{3})^{2}

使用指数法则:

(a \cdot b)^{n} = a^{n} b^{n}

= 3^{2} a^{2} (b^{3})^{2}

(b^{3})^{2} : b^{6}

= 3^{2} a^{2} b^{6}

3^{2} = 9

= 9 a^{2} b^{6}

e x p an d 10 - 20 (e^{- 0.25 x} - e^{- 0.5 x})

e x p an d (- 3 - - i)^{7}

e x p an d (3, 7) (x + 4, y - 1)

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

e x p an d - \frac{3 ( 35 + 5 )}{10}