简便计算: (1)123452-12344×12346. (2)3.76542+0.4692×3.7654+0.23462.

问题描述:

简便计算:
(1)123452-12344×12346.
(2)3.76542+0.4692×3.7654+0.23462

(1)原式=123452-(12345-1)×(12345+1)=123452-(123452-1)=123452-123452+1=1;
(2)原式=3.76542+2×0.2346×3.7654+0.23462=(3.7654+0.2346)2=42=16;