想一想,怎样计算简便?1999+199.9+1.999+1.111

分类: 作业答案 • 2021-12-19 11:37:15

问题描述：

答

1999+1+199.9+0.1+1.999+0.001+0.01=2000+200+2+0.01=2202.01

答

1999+199.9+1.999+1.111
=(1999+1)+(199.9+0.1)+(1.999+0.001)+0.01
=2000+200+2+0.01
=2202.01

答

1999+199.9+1.999+1.111
=1999+199.9+1.999+1+0.1+0.01+0.001
=1999+1+199.9+0.1+1.999+0.001+0.01
=2000+200+2+0.01
=2202.01

答

1999+199.9+1.999+1+0.1+0.01+0.001
=（1999+1）+（199.9+0.1）+（1.999+0.001）+0.01
=2000+200+2+0.01
=2202.01