0.1999+1.999+19.99+199.9如何用简便算法算出来

0.1999+1.999+19.99+199.9
＝0.2+2+20+200-0.1-0.01-0.001.0.0001
＝222.2-0.1111
＝222.0889

0.1999+1.999+19.99+199.9
=(1999+19990+199900+1999000)/10000
=(2000-1+20000-10+200000-100+2000000-1000)/10000
=(2222000-1111)/10000
=2220889/10000
=222.0889

0.1999+1.999+19.99+199.9
＝0.2+2+20+200-0.1-0.01-0.001.0.0001
＝222.2-0.1111
＝222.0889

0.1999+1.999+19.99+199.9
=(1999+19990+199900+1999000)/10000
=(2000-1+20000-10+200000-100+2000000-1000)/10000
=(2222000-1111)/10000
=2220889/10000
=222.0889
两个都可以随便选

0.1999+1.999+19.99+199.9
＝0.2+2+20+200-0.1-0.01-0.001.0.0001
＝222.2-0.1111
＝222.0889
或
0.1999+1.999+19.99+199.9
=(1999+19990+199900+1999000)/10000
=(2000-1+20000-10+200000-100+2000000-1000)/10000
=(2222000-1111)/10000
=2220889/10000
=222.0889

0.1999+1.999+19.99+199.9 ＝0.2+2+20+200-0.1-0.01-0.001.0.0001 ＝222.2-0.1