计算:12345×2345+2469×38257.

问题描述:

计算:12345×2345+2469×38257.

12345×2345+2469×38257
=12345×2345++12345×7651.4,
=12345×(2345+7651.4),
=12345×9996.4,
=12345×(10000-0.6),
=12345×10000-12345×0.6,
=123450000-7407,
=123442593.