要过程哦
第1个回答 2008-08-07
答案:
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
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
第2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本回答被提问者采纳
=2+20+200+2000+20000-0.5
=22222-0.5
=22221.5本回答被提问者采纳
第3个回答 2015-12-06
简算方法计算如下:
1.9+19.9+199.9+1999.9+19999.9
=2+20+200+2000+20000-0.5
=22222-0.5
=22221.5
1.9+19.9+199.9+1999.9+19999.9
=2+20+200+2000+20000-0.5
=22222-0.5
=22221.5
第4个回答 2008-08-07
正确答案
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
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
第5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