展开 ((m-Np)^2)/(Np(1-p))

解答

展开

\frac{( m - Np ) ^{2}}{Np ( 1 - p )}

\frac{m ^{2} - 2 N m p + N ^{2} p ^{2}}{Np - N p ^{2}}

求解步骤

\frac{( m - Np ) ^{2}}{Np ( 1 - p )}

(m - Np)^{2} = m^{2} - 2 N m p + N^{2} p^{2}

= \frac{m ^{2} - 2 N m p + N ^{2} p ^{2}}{Np ( - p + 1 )}

乘开

Np (1 - p) : Np - N p^{2}

= \frac{m ^{2} - 2 N m p + N ^{2} p ^{2}}{Np - N p ^{2}}

e x p an d \frac{( x - 1 ) ( x - 3 )}{x - 2}

e x p an d \frac{( 8 b + 9 ) ^{3}}{1728}

e x p an d (4 x^{2} + x^{2} u - 3 u^{2} x^{2}) d x

e x p an d \frac{1 + 4 x ^{2}}{( 1 - x ^{2} ) ^{2}}

e x p an d \frac{1}{x ^{2} ( x ^{2} + 25 )}