题目内容

(2012?北京)
(1)66+8= (2)47-8= (3)25×4= (4)56÷4= (5)3.07÷3=
(6)471-299= (7)600÷5= (8)1.06×8= (9)6.6+4= (10)1-0.05=
(11)3.8+6.2= (12)3.8÷0.19= (13)0.1+0.1÷0.1 (14)24×0.5= (15)1.8÷0.2=
(16)1÷0.25= (17)8-0.8= (18)1.5×0.6= (19)1.5÷0.3= (20)
2
9
×4=
(21)
4
9
×
3
8
=
(22)12÷
3
7
=
(23)
5
8
-
1
8
=
(24)1-
3
11
=
(25)
5
6
+
1
6
=
(26)
3
7
×
5
6
=
(27)
1
3
+
1
6
=
(28)
1
5
-
1
7
=
(29)
1
2
÷
3
4
=
(30)
2
9
+
2
3
=
分析:本题运用运算法则直接求解,整数加减法的题目要注意进位和退位;小数的计算要注意小数点的位置;分数的运算要注意把结果化成最简分数.
解答:解:
(1)66+8=74, (2)47-8=39, (3)25×4=100, (4)56÷4=14, (5)3.07÷3=
307
300
(6)471-299=172, (7)600÷5=120, (8)1.06×8=8.48, (9)6.6+4=10.6, (10)1-0.05=0.95,
(11)3.8+6.2=10, (12)3.8÷0.19=20, (13)0.1+0.1÷0.1=1.1, (14)24×0.5=12, (15)1.8÷0.2=9,
(16)1÷0.25=4, (17)8-0.8=7.2, (18)1.5×0.6=0.9, (19)1.5÷0.3=5, (20)
2
9
×4=
8
9
(21)
4
9
×
3
8
=
1
6
(22)12÷
3
7
=28,
(23)
5
8
-
1
8
=
1
2
(24)1-
3
11
=
8
11
(25)
5
6
+
1
6
=1,
(26)
3
7
×
5
6
=
5
14
(27)
1
3
+
1
6
=
1
2
(28)
1
5
-
1
7
=
2
35
(29)
1
2
÷
3
4
=
2
3
(30)
2
9
+
2
3
=
8
9
点评:本题考查了基本的运算,要注意在平时多积累经验,逐步提高运算的速度和准确性.
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