简便计算:199.4×19.93—199.3×19.92

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/28 06:02:56
简便计算:199.4×19.93—199.3×19.92

简便计算:199.4×19.93—199.3×19.92
简便计算:199.4×19.93—199.3×19.92

简便计算:199.4×19.93—199.3×19.92
199.4×19.93-199.3×19.92
=(199.3+0.1)×19.93-199.3×(19.93-0.01)
=199.3×19.93+19.93×0.1-199.3×19.93+199.3×0.01
=1.993+1.993
=(2-0.007)+(2-0.007)
=4-0.014
=3.986

199.4x19.93-199.3x19.92
=199.4x19.93-19.93x199.2
=19.93(199.4-199.2)
=19.93x0.2
=3.986