展开 ((0.42-x)(x))/(0.14-x)

解答

展开

\frac{( 0.42 - x ) ( x )}{0.14 - x}

\frac{0.42 x - x ^{2}}{0.14 - x}

求解步骤

\frac{( 0.42 - x ) ( x )}{0.14 - x}

去除括号:

(a) = a

= \frac{( 0.42 - x ) x}{0.14 - x}

乘开

(0.42 - x) x : 0.42 x - x^{2}

= \frac{0.42 x - x ^{2}}{0.14 - x}

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