3.7654^2+0.4692×3.7654+0.2346^2=3.7654^2+(2×0.2346×3.7654)+0.2346^2=(3.7654+0.2346)^2 (这步应该学过吧?)=4^2=16
利用a^2+2ab+b^2=(a+b)^23.7654^2+0.4692×3.7654+0.2346^2=3.7654^2+2*0.2346×3.7654+0.2346^2=(3.7654+0.2346)^2=4^2=16