方法一：1.1×1.2×1.3×1.4×1.5设：1.1=a 可知：1.21=a²,1.331=a³,1.4641=(a²)²,1.61051=a×(a²)²那么：原式=a(a+0.1)(a+0.2)(a+0.3)(a+0.4)=a(a²+0.2a+0.1a+0.02)(a²+0....