题目内容

(2006?武侯区)
48.9-12.7-0.3= 56.4-39.7+24.3= 404+26×9= 3.5×2.8-4.7=
18.2+38.4÷4.8=
1
4
+
5
8
-
1
2
=
4
3
-
3
4
+
1
6
=
9
13
×
3
8
+
5
8
×
9
13
=
9
4
×
2
3
-
2
3
=
9
16
÷
3
8
+
1
4
1
4
+
1
5
)÷
9
10
-
1
7
=
4
15
+
2
5
×(
5
6
-
2
3
)=
分析:(1)一个数连续减去两个数,等于减去这两个数的和,
(2)(3)(4)(5)(6)(7)(10)(11)(12)根据四则运算的计算顺序进行计算,
(8)(9)根据乘法分配律进行计算,
解答:解:(1)48.9-12.7-0.3,
=48.9-(12.7+0.3),
=48.9-13,
=35.9;

(2)56.4-39.7+24.3,
=16.7+24.3,
=41;

(3)404+26×9,
=404+234,
=638;

(4)3.5×2.8-4.7,
=9.8-4.7,
=5.1;

(5)18.2+38.4÷4.8,
=18.2+8,
=26.2;

(6)
1
4
+
5
8
-
1
2

=
2
8
+
5
8
-
4
8

=
3
8


(7)
4
3
-
3
4
+
1
6

=
16
12
-
9
12
+
2
12

=
3
4


(8)
9
13
×
3
8
+
5
8
×
9
13

=
9
13
×(
3
8
+
5
8
),
=
9
13
×1,
=
9
13


(9)
9
4
×
2
3
-
2
3

=
3
2
-
2
3

=
9
6
-
4
6

=
5
6


(10)
9
16
÷
3
8
+
1
4

=
3
2
+
1
4

=1
3
4


(11)(
1
4
+
1
5
)÷
9
10
-
1
7

=
9
20
×
10
9
-
1
7

=
1
2
-
1
7

=
5
14


(12)
4
15
+
2
5
×(
5
6
-
2
3
),
=
4
15
+
2
5
×
1
6

=
4
15
+
1
15

=
1
3
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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