简便计算:18.9*178.178+0.49-17.8*189.189十万火急!
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 16:08:33
![简便计算:18.9*178.178+0.49-17.8*189.189十万火急!](/uploads/image/z/55594-10-4.jpg?t=%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%EF%BC%9A18.9%2A178.178%2B0.49-17.8%2A189.189%E5%8D%81%E4%B8%87%E7%81%AB%E6%80%A5%21)
简便计算:18.9*178.178+0.49-17.8*189.189十万火急!
简便计算:18.9*178.178+0.49-17.8*189.189
十万火急!
简便计算:18.9*178.178+0.49-17.8*189.189十万火急!
18.9*178.178+0.49-17.8*189.189
=18.9*178*1.001-17.8*189*1.001+0.49
=0+0.49
=0.49
记住178.178=178*1.001
简便计算:18.9*178.178+0.49-17.8*189.189
=18.9*178*1.001-17.8*189*1.001+0.49
=189*17.8*1.001-17.8*189*1.001+0.49
=0.49
18.9*178.178+0.49-17.8*189.189
=18.9*178+18.9*0.178-17.8*189-17.8*0.189+0.49
=18.9*178-178*18.9+18.9*0.178-0.178*18.9+0.49
=0.49