=3999+1+399.9+0.1+39.99+0.01+3.999+0.001
=4000+400+40+4
=4444
.001
3999十399.9十39.99十3.999十3.111
＝3999＋1＋399.9＋0.1＋39.99＋0.01＋3.999＋0.001＋2
＝4000＋400＋40＋4＋2
＝4446
=3999+400-0.1+40-0.01+4-0.001+3.111
=(3999+400+40+4)+(3,111-0,1-0,01-0,001)
=4443+3
=4446
4000-1+400-0.1+40-0.01+4-0.001+3+0.1+0.01+0.001
=4444+3-1=4446
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