如题所述
1.9+19.9+199.9+0.3=(1.9+0.1)+(19.9+0.10+(199.9+0.1)=2+20+200=222
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第1个回答 2013-09-14
1.9+19.9+199.9+0.3
=2-0.1+20-0.1+200-0.1+0.3
=2+20+200
=222
满意采纳,不懂追问
=2-0.1+20-0.1+200-0.1+0.3
=2+20+200
=222
满意采纳,不懂追问
第2个回答 2013-09-14
1.9+19.9+199.9+0.3
= (2-0.1)+(20-0.1)+(200-0.1)
=2+20+200
=222
= (2-0.1)+(20-0.1)+(200-0.1)
=2+20+200
=222
第3个回答 2020-10-03
24646846416+697794