要过程哦
第1个回答 2008-08-07
1.9+19.9+199.9+1999.9+19999.9
=2+20+200+2000+20000-0.5
=22222-0.5
=22221.5
=2+20+200+2000+20000-0.5
=22222-0.5
=22221.5
第2个回答 2008-08-07
1.9+19.9+199.9+1999.9+19999.9
=(2-0.1)+(20-0.1)+(200-0.1)+(2000-0.1)+(20000-0.1)
=2+20+200+2000+20000-0.5
=22222-0.5
=22221.5
=(2-0.1)+(20-0.1)+(200-0.1)+(2000-0.1)+(20000-0.1)
=2+20+200+2000+20000-0.5
=22222-0.5
=22221.5
第3个回答 2008-08-07
2-0.1+20-0.1+200-0.1+2000-0.1+20000-0.1=22222-0.5=22221.5
第4个回答 2008-08-07
(2+20+200+2000+20000)-(0.1×5)
=22222-0.5
=22221.5
=22222-0.5
=22221.5
第5个回答 2008-08-07
2+20+200+2000+20000-0.1*5