来自宋振国的问题
简便计算53×54+54×16+69×25+21×69(3214-2213)×214×21356×113+59×213+518×61323+215+235+263+299+215.
简便计算
53×54+54×16+69×25+21×69(3214-2213)×214×21356×113+59×213+518×61323+215+22130+22131+22132+215.


简便计算53×54+54×16+69×25+21×69(3214-2213)×214×21356×113+59×213+518×61323+215+235+263+299+215.
简便计算
53×54+54×16+69×25+21×69(3214-2213)×214×21356×113+59×213+518×61323+215+22130+22131+22132+215.
(1)53×54+54×16+69×25+21×69,=(53+16)×54+69×25+21×69,=69×54+69×25+21×69,=(54+25+21)×69,=100×69,=6900;(2)(3214-2213)×214×213,=3214×214×213-2213×214×213,=639-428,=211...