用简便方法计算: (1)20062-20052; (2)172+34×13+132.

问题描述:

用简便方法计算:
(1)20062-20052;           
(2)172+34×13+132

(1)原式=(2006+2005)(2006-2005)
=4011×1
=4011;
(2)原式=172+2×17×13+132
=(17+13)2
=900.