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= |
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(
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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,
(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)
+
-
,
=
+
-
,
=
;
(7)
-
+
=
-
+
,
=
;
(8)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(9)
×
-
,
=
-
,
=
-
,
=
;
(10)
÷
+
,
=
+
,
=1
;
(11)(
+
)÷
-
,
=
×
-
,
=
-
,
=
;
(12)
+
×(
-
),
=
+
×
,
=
+
,
=
.
=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 |
=
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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