2.2+3.57= 27×
1
9
=
4
5
×
3
4
=
20×
1
4
=
1
4
×
2
3
×
1
5
=
1
2
×
1
3
=
6
7
×
1
3
=
1
6
×
4
7
=
5
16
×
18
15
=
1
3
×(1-
1
4
)=
分析:根據(jù)小數(shù)和分數(shù)加減乘除的計算方法進行計算.
解答:
解:2.2+3.57=5.77, 27×
1
9
=3,
4
5
×
3
4
=
3
5
20×
1
4
=5,
1
4
×
2
3
×
1
5
=
1
30
,
1
2
×
1
3
=
1
6
6
7
×
1
3
=
2
7
,
1
6
×
4
7
=
2
21
5
16
×
18
15
=
3
8
,
1
3
×(1-
1
4
)=
1
4
點評:口算時,注意運算符號和數(shù)據(jù),然后再進一步計算.
練習冊系列答案
相關習題

科目:小學數(shù)學 來源: 題型:

口算
260+400= 640-400= 900×9= 400÷5= 34×2=
4800÷8= 250-70= 140×3= 64-0= 940+60=
4×500= 120×4=
5
6
-
2
6
=
5
8
+
2
8
=
1
7
+
6
7
=
605+200= 24÷5= 1-
2
9
=
60×9= 400×7=
210×3= 45÷9= 39÷7= 125×8= 133×2=
89×5≈ 181×2≈ 12×7≈ 512×4≈ 311×3≈
960-160= 280+80= 32×3=
5
7
-
2
7
=
7
7
-
2
8
=
15+5×2= 15×4-25= 10+10×0= 20-12÷3= 72÷8-8=

查看答案和解析>>

科目:小學數(shù)學 來源: 題型:

(2013?華亭縣模擬)口算.
2.2+3.57= 1.4-0.6= 3.25×4= 15×
1
5
=
44÷
11
10
=
5
9
-
5
6
+
4
9
=
2-
1
5
-
4
5
=
2
3
÷2=
1
3
+
2
5
=
7
8
×
2
7
=.

查看答案和解析>>

科目:小學數(shù)學 來源: 題型:

直接寫上得數(shù).
530+380=
2-
6
7
=
0.25×40= 9600÷80=
2.2+3.57=
4
3
÷
2
3
=
5
6
×
8
15
=
8.4÷0.7=
1
3
÷2÷
1
3
=
1.9×4×0.5=
8
9
-
5
6
+
1
9
=
2
7
+
5
7
×4
=

查看答案和解析>>

科目:小學數(shù)學 來源: 題型:

5
11
÷6+
1
6
×
6
11
3
14
+
5
21
)×42
7
12
-
1
4
)÷
1
3
+
1
6
7.25×20%+2.75×20%
4
5
×
3
8
+
5
6
÷
5
12
3.57×[
2
7
÷(2.6-
3
5
)].

查看答案和解析>>

同步練習冊答案