问大家几道简便运算的题该怎么做?666X7+58X111 101X99X999+999 43/5X2.7+62X14%+35X0.86

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/01 16:26:41

问大家几道简便运算的题该怎么做?666X7+58X111 101X99X999+999 43/5X2.7+62X14%+35X0.86
问大家几道简便运算的题该怎么做?
666X7+58X111 101X99X999+999 43/5X2.7+62X14%+35X0.86

问大家几道简便运算的题该怎么做?666X7+58X111 101X99X999+999 43/5X2.7+62X14%+35X0.86
666X7+58X111
=111×42+58×111
=111×(42+58)
=111×100
=11100
101×99×999+999
=(100+1)×(100-1)×999+999
=(100²-1+1)×999
=10000×999
=9990000
43/5X2.7+62X14%+35X0.86
=0.86×27+62×0.14+0.86×35
=0.86×(27+35)+62×0.14
=0.86×62+62×0.14
=(0.86+0.14)×62
=1×62
=62