展开 ((7y-6)^2)/2

解答

展开

\frac{( 7 y - 6 ) ^{2}}{2}

\frac{49 y ^{2}}{2} - 42 y + 18

求解步骤

\frac{( 7 y - 6 ) ^{2}}{2}

(7 y - 6)^{2} = 49 y^{2} - 84 y + 36

= \frac{49 y ^{2} - 84 y + 36}{2}

使用分式法则:

\frac{a \pm b}{c} = \frac{a}{c} \pm \frac{b}{c}

\frac{49 y ^{2} - 84 y + 36}{2} = \frac{49 y ^{2}}{2} - \frac{84 y}{2} + \frac{36}{2}

= \frac{49 y ^{2}}{2} - \frac{84 y}{2} + \frac{36}{2}

数字相除:

\frac{84}{2} = 42

= \frac{49 y ^{2}}{2} - 42 y + \frac{36}{2}

数字相除:

\frac{36}{2} = 18

= \frac{49 y ^{2}}{2} - 42 y + 18

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