99乘以1.2加99的简便方法

来源:百度知道 编辑:UC知道 时间:2024/07/06 13:24:35
求99乘以1.2加99的简便方法。急!!!!!快一点了!!!!!!!!!!!!!!!!

99×1.2+99
=99×(1.2+1)
=99×2.2
=(100-1)×2.2
=100×2.2-1×2.2
=220-2.2
=217.8

99*1.2+99
=(100-1)*1.2+(100-1)
=(100-1)*(1.2+1)
=(100-1)*2.2
=100*2.2-2.2
=220-2.2
=217.8

99×1.2+99
=99×1.2+99×1
=99×(1.2+1)
=99×2.2
=(100-1)×2.2
=100×2.2-1×2.2
=220-2.2
=217.8

99*1.2+99=99*2.2=(100-1)*2.2=220-2.2=217.8

100*1.2-1.2+100*100-99*2-1

99乘以1.2加99的简便方法
99*1.2+99
=99*(1.2+1)
=99*2.2
=(100-1)*2.2
=220-2.2
=217.8