用待定系数法求……求(x+y)^5
问题描述:
用待定系数法求……
求(x+y)^5
答
(x+y)^5 =x^5+5x^4y+10x^3y^2+10x^2y^3+5xy^4+y^5
用待定系数法求……
求(x+y)^5
(x+y)^5 =x^5+5x^4y+10x^3y^2+10x^2y^3+5xy^4+y^5