化简 (-3)((-b)/6)^2-b((-b)/6)

解答

化简

(- 3) \cdot (\frac{- b}{6})^{2} - b \cdot (\frac{- b}{6})

- \frac{b ^{2}}{12} + \frac{b ^{2}}{6}

求解步骤

(- 3) (\frac{- b}{6})^{2} - b (\frac{- b}{6})

化简

(- 3) (\frac{- b}{6})^{2} - b (\frac{- b}{6}) : - 3 (\frac{- b}{6})^{2} - b \frac{- b}{6}

= - 3 (\frac{- b}{6})^{2} - b \frac{- b}{6}

(\frac{- b}{6})^{2} = \frac{b ^{2}}{36}

b \frac{- b}{6} = - \frac{b ^{2}}{6}

= - 3 \cdot \frac{b ^{2}}{36} - (- \frac{b ^{2}}{6})

使用法则:

a - (- b) = a + b

- 3 \cdot \frac{b ^{2}}{36} - (- \frac{b ^{2}}{6}) = - 3 \cdot \frac{b ^{2}}{36} + \frac{b ^{2}}{6}

= - 3 \cdot \frac{b ^{2}}{36} + \frac{b ^{2}}{6}

化简

- 3 \cdot \frac{b ^{2}}{36} : - \frac{b ^{2}}{12}

= - \frac{b ^{2}}{12} + \frac{b ^{2}}{6}

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