解析：(x+y)^5=x^5+5x⁴y+5x⁴z+10x³y²+20x³yz+10x³z²+10x²y³+30x²y²z+30x²yz²+10x²z³+5xy⁴+20xy³z+30xy²z²+20xyz³+5xz⁴+y^5+5y⁴z+10y³z²+10y²z³+5yz⁴+z^5附图
