Question

3．能簡算的要簡算．
0.75+1.8-2.033                       
2.54-0.7-0.54           
6.78+2.46+3.22
14.25+4.72+5.75+5.28           
6.27+3.5-6.27．

Answer 1

分析 ①根據(jù)四則混合運算的運算順序計算即可；
②根據(jù)加法交換律計算；
③根據(jù)加法交換律計算；
④根據(jù)加法交換律及結(jié)合律計算；
⑤根據(jù)加法交換律計算．

解答 解：①0.75+1.8-2.033
=2.55-2.033
=0.517
                       
②2.54-0.7-0.54        
=2.54-0.54-0.7
=2-0.7
=1.3
   
③6.78+2.46+3.22
=6.78+3.22+2.46
=10+2.46
=12.46

④14.25+4.72+5.75+5.28 
=（14.25+5.75）+（4.72+5.28）
=20+10
=30
         
⑤6.27+3.5-6.27
=6.27-6.27+3.5
=0+3.5
=3.5

點評 完成本題要注意分析式中數(shù)據(jù)，運用合適的簡便方法計算．