你如何使用二项式定理展开(x-5)^ 5?

你如何使用二项式定理展开(x-5)^ 5?
Anonim

回答:

#( - 5 + x)^ 5 = -3125 + 3125x -1250x ^ 2 + 250x ^ 3-25x ^ 4 + x ^ 5#

说明:

#(A + BX)^ N = sum_(R = 0)^ N((N),(R))一^(NR)(BX)^ R = sum_(R = 0)^ N(N!)/ (R!(NR)!)一^(NR)(BX)^ R#

#( - 5 + x)的^ 5 = sum_(R = 0)^ 5(5!)/(R(5-R)!)( - 5)^(5-R)X ^ R#

#( - 5 + x)的^ 5 =(5!)/(0(5-0)!)!( - 5)^(5-0)的x ^ 0 +(!5)/(1(5- 1))( - 5)^(5-1)的x ^ 1 +(5)/(2(5-2))( - !!! 5)^(5-2)X ^ 2 +(5! )/(3(5-3!))!( - 5)^(5-3)的x ^ 3 +(5)/(4(5-4!))( - 5)^(5-4 )的x ^ 4 +(5)/(5(5-5!))( - 5)^(5-5)X ^ 5#

#( - 5 + x)的^ 5 =(5!)/(0 5!)( - 5)^ 5 +(5!)/(1 4!)( - 5)^ 4×+(!5)/ (2 3!)( - 5)^ 3×^ 2 +(5!)/(3 2!)( - 5)^ 2×^ 3 +(5!)/(4×1!)( - 5) X ^ 4 +(5!)/(5!0!)X ^ 5#

#( - 5 + x)的^ 5 =( - 5)^ 5 + 5(-5)^ 4×+ 10(-5)^ 3×^ 2 + 10(-5)^ 2×^ 3 + 5(-5)的x ^ 4 + X ^ 5#

#( - 5 + x)^ 5 = -3125 + 3125x -1250x ^ 2 + 250x ^ 3-25x ^ 4 + x ^ 5#