题目内容
能简算的要简算.
| 48×(
|
| ||||||||||||||||||
| (
|
| ||||||||||||||||||
25
|
|
| ||||||||||||||||||
55×
| 97×
| 1999÷2000×2001 | ||||||||||||||||||
| 5-
| 37×
| ||||||||||||||||||
|
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则
分析:(1)、(4)根据乘法交换律进行简算;
(2)、(3)、(5)、(7)、(9)、(10)、(11)、(12)、(13)、(15)根据乘法分配律进行简算;
(6)根据分数的拆项进行简算;
(8)先算乘法,再根据加法结合律进行简算;
(14)根据加法交换律和结合律进行简算;
(16)按照从左向右的顺序进行计算.
(2)、(3)、(5)、(7)、(9)、(10)、(11)、(12)、(13)、(15)根据乘法分配律进行简算;
(6)根据分数的拆项进行简算;
(8)先算乘法,再根据加法结合律进行简算;
(14)根据加法交换律和结合律进行简算;
(16)按照从左向右的顺序进行计算.
解答:
解:(1)
×
×65
=
×65×
=1×
=
;
(2)48×(
+
-
)
=48×
+48×
-48×
=8+16-4
=24-4
=20;
(3)
×0.46+
×0.54
=
×(0.46+0.54)
=
×1
=
;
(4)
×
×
=
×
×
=
×
=
;
(5)(
+
)×6
=
×6+
×6
=16+9
=25;
(6)
+
+
+…+
=(1-
)+(
-
)+(
-
)+…+(
-
)
=1-
+
-
+
-
+…+
-
=1-
=
;
(7)25
×4
=(25+
)×4
=25×4+
×4
=100+3
=103;
(8)
+
×
+
=
+
+
=
+(
+
)
=
+
=
;
(9)
×
+
×
=
×
+
×
=
×(
+
)
=
×1
=
;
(10)55×
-45×
=(55-45)×
=10×
=8;
(11)97×
=(96+1)×
=96×
+1×
=95+
=95
;
(12)1999÷2000×2001
=
×2001
=
×(2000+1)
=
×2000+
×1
=1999+
=1999
;
(13)
×99+
=
×(99+1)
=
×100
=25;
(14)5-
+
-
=(5+
)-(
+
)
=5
-1
=3
;
(15)37×
+62×
=(37+62)×
=99×
=88;
(16)
-
+
=
+
=
.
1 |
65 |
7 |
18 |
=
1 |
65 |
7 |
18 |
=1×
7 |
18 |
=
7 |
18 |
(2)48×(
1 |
6 |
1 |
3 |
1 |
12 |
=48×
1 |
6 |
1 |
3 |
1 |
12 |
=8+16-4
=24-4
=20;
(3)
13 |
3 |
13 |
3 |
=
13 |
3 |
=
13 |
3 |
=
13 |
3 |
(4)
4 |
5 |
3 |
8 |
5 |
9 |
=
4 |
5 |
5 |
9 |
3 |
8 |
=
4 |
9 |
3 |
8 |
=
1 |
6 |
(5)(
8 |
3 |
3 |
2 |
=
8 |
3 |
3 |
2 |
=16+9
=25;
(6)
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
99×100 |
=(1-
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
99 |
1 |
100 |
=1-
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
99 |
1 |
100 |
=1-
1 |
100 |
=
99 |
100 |
(7)25
3 |
4 |
=(25+
3 |
4 |
=25×4+
3 |
4 |
=100+3
=103;
(8)
6 |
7 |
1 |
7 |
7 |
8 |
1 |
8 |
=
6 |
7 |
1 |
8 |
1 |
8 |
=
6 |
7 |
1 |
8 |
1 |
8 |
=
6 |
7 |
1 |
4 |
=
31 |
28 |
(9)
17 |
23 |
31 |
35 |
4 |
23 |
17 |
35 |
=
17 |
23 |
31 |
35 |
4 |
35 |
17 |
23 |
=
17 |
23 |
31 |
35 |
4 |
35 |
=
17 |
23 |
=
17 |
23 |
(10)55×
4 |
5 |
4 |
5 |
=(55-45)×
4 |
5 |
=10×
4 |
5 |
=8;
(11)97×
95 |
96 |
=(96+1)×
95 |
96 |
=96×
95 |
96 |
95 |
96 |
=95+
95 |
96 |
=95
95 |
96 |
(12)1999÷2000×2001
=
1999 |
2000 |
=
1999 |
2000 |
=
1999 |
2000 |
1999 |
2000 |
=1999+
1999 |
2000 |
=1999
1999 |
2000 |
(13)
1 |
4 |
1 |
4 |
=
1 |
4 |
=
1 |
4 |
=25;
(14)5-
11 |
12 |
3 |
11 |
3 |
4 |
=(5+
3 |
11 |
11 |
12 |
3 |
4 |
=5
3 |
11 |
2 |
3 |
=3
20 |
33 |
(15)37×
8 |
9 |
8 |
9 |
=(37+62)×
8 |
9 |
=99×
8 |
9 |
=88;
(16)
24 |
25 |
4 |
5 |
1 |
5 |
=
4 |
25 |
1 |
5 |
=
9 |
25 |
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定律简便计算.
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