0.1999+1.999+19.99+199.9怎样巧算(有过程)

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0.1999+1.999+19.99+199.9怎样巧算(有过程)0.1999+1.999+19.99+199.9怎样巧算(有过程)0.1999+1.999+19.99+199.9怎样巧算(有过程)孩

0.1999+1.999+19.99+199.9怎样巧算(有过程)
0.1999+1.999+19.99+199.9怎样巧算(有过程)

0.1999+1.999+19.99+199.9怎样巧算(有过程)

孩子啊,作弊啊

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

=1999*(0.0001+0.001+0.01+0.1)
=1999*0.1111
=222.0889
=0.2-0.0001+2-0.001+20-0.01+200-0.1
=222.2-0.1111
=222.0889