1999+199.9+19.99+1.999
=2000-1+200-0.1+20-0.01+2-0.001
=2000+200+20+(2-1-0.1-0.01-0.001)
=2220+0.889
=2220.889
1999+199.9+19.99+1.999=(简便运算)
1999+199.9+19.99+1.999=(简便运算)
数学人气:620 ℃时间:2020-01-28 00:58:13
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