口算:
4
5
+
3
5
=
1
7
+
1
5
=
1
3
+2=
1
4
+
1
2
=
1-
9
14
=
0.23×0.1=
2
5
+
2
3
-
2
5
=
4
5
-
4
5
=
2÷0.5=
5
8
-
3
8
=
分析:本題根據(jù)分數(shù),小數(shù),整數(shù)的加法、減法、乘法與除法的運算法則計算即可;
2
5
+
2
3
-
2
5
利用加法交換律計算
2
5
-
2
5
+
2
3
計算簡便.
解答:
解:
4
5
+
3
5
=
7
5
1
7
+
1
5
=
12
35
1
3
+2=2
1
3
1
4
+
1
2
=
3
4
1-
9
14
=
5
14
0.23×0.1=0.023
2
5
+
2
3
-
2
5
=
2
3
4
5
-
4
5
=0
2÷0.5=4
5
8
-
3
8
=
1
4
點評:完成本題要注意分析式中數(shù)據(jù)的特點,快速準確得出答案.
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