问题标题:
简便计算;1.9+1.99+1.999+1.9999+1.9999928*1111+9999*8
问题描述:
简便计算;1.9+1.99+1.999+1.9999+1.9999928*1111+9999*8
孙永军回答:
1.9+1.99+1.999+1.9999+1.99999
=2-0.1+2-0.01+2-0.001+2-0.0001+2-0.00001
=10-0.11111
=9.88889
28*1111+9999*8
=28*1111+1111*9*8
=1111*(28+72)
=1111*100
=111100
查看更多