1998+199.8+19.98+1.998+0.1998
=1998(1+0.1+0.01+0.001+0.0001)
=1998*1.1111
=(2000-2)*1.1111
=2222.2-2.2222
=2219.9778
1998(1+0.1+0.01+0.001+0.0001)
=2219.9778
等比数列……首项1998 公比0.1
等比数列。。。首项1998 公比0.1
1998(1+0.1+0.01+0.001+0.0001)
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