简便运算: 9999.9+999.9+99.9+9.9?

9999.9+999.9+99.9+9.9
2025-03-10 11:45:23
推荐回答(3个)
回答1:

9999.9+999.9+99.9+9.9
=10000-0.1+1000-0.1+100-0.1+10-0.1
=11109.6

回答2:

9999.9+999.9+99.9+9.9
=(10000-0.1)+(1000-0.1)+(100-0.1)+(10-0.1)
=(10000+1000+100+10)-0.1×4
=11110-0.4
=11109.6

回答3:

运用交换律计算:10000-0.1+1000-0.1+100-0.1+10-0.1=11110-0.4=11109.6