99.99×0.8+11.11×2.8拓展提高题,_数学解答

99.99×0.8+11.11×2.8拓展提高题,

人气：464 ℃　时间：2020-10-01 08:49:53

解答

99.99x0.8+11.11x2.8
=(11.11x9)x0.8+11.11x2.8
=11.11x(9x0.8)+11.11x2.8
=11.11x7.2+11.11x2.8
=11.11x(7.2+2.8)
=11.11x10
=111.1