56+37=80-16=31.5+5=12-1.1=
2×0.2=2.87÷0.7=30÷50=25×8=
3
8
×
4
5
=
1
4
+
1
5
=
1
6
+
5
6
=
7
15
-
1
15
=
4
15
÷
2
5
=12×
2
3
=
4
5
=
7
8
=
分析:根據(jù)小數(shù)、分數(shù)、整數(shù)四則運算的計算法則及混合運算的順序進行計算即可.
解答:解:56+37=93;         80-16=64;                  31.5+5=36.5;                12-1.1=10.9
   2×0.2=0.4;        2.87÷0.7=4.1                30÷50=0.6;                 25×8=200;
  
3
8
×
4
5
=0.3;        
1
4
+
1
5
=0.45;                
1
6
+
5
6
=1;                   
7
15
-
1
15
=0.4;
 
4
15
÷
2
5
=
2
3
;         12×
2
3
=8;                   
4
5
=1.25;                  
7
8
=0.
點評:本題主要考查小數(shù)、分數(shù)、整數(shù)四則運算及混合運算,要看清運算符號和數(shù)字.
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