题目内容
正确、合理、灵活的计算.
×1
÷
×
×
×
×
+
÷
48×
+48×
30×(
-
-
).
5 |
7 |
2 |
5 |
16 |
27 |
3 |
8 |
3 |
8 |
5 |
6 |
2 |
13 |
39 |
20 |
3 |
5 |
2 |
11 |
2 |
11 |
5 |
2 |
48×
5 |
8 |
3 |
8 |
30×(
4 |
5 |
1 |
3 |
1 |
15 |
分析:(1)把1
化成假分数,然后再约分计算;
(2)根据乘法结合律进行简算;
(3)根据乘法结合律简算;
(4)根据乘法分配律进行简算;
(5)根据乘法分配律进行简算;
(6)根据乘法分配律进行简算.
2 |
5 |
(2)根据乘法结合律进行简算;
(3)根据乘法结合律简算;
(4)根据乘法分配律进行简算;
(5)根据乘法分配律进行简算;
(6)根据乘法分配律进行简算.
解答:解:(1)
×1
=
×
=1;
(2)
÷
×
=
×(
÷
)
=
×1
=
;
(3)
×
×
=
×(
×
)
=
×
=
;
(4)
×
+
÷
=
×
+
×
=(
+
)×
=1×
=
;
(5)48×
+48×
=48×(
+
)
=48×1
=48;
(6)30×(
-
-
)
=30×
-30×
-30×
=24-10-2
=14-2
=12.
5 |
7 |
2 |
5 |
=
5 |
7 |
7 |
5 |
=1;
(2)
16 |
27 |
3 |
8 |
3 |
8 |
=
16 |
27 |
3 |
8 |
3 |
8 |
=
16 |
27 |
=
16 |
27 |
(3)
5 |
6 |
2 |
13 |
39 |
20 |
=
5 |
6 |
2 |
13 |
39 |
20 |
=
5 |
6 |
3 |
10 |
=
1 |
4 |
(4)
3 |
5 |
2 |
11 |
2 |
11 |
5 |
2 |
=
3 |
5 |
2 |
11 |
2 |
11 |
2 |
5 |
=(
3 |
5 |
2 |
5 |
2 |
11 |
=1×
2 |
11 |
=
2 |
11 |
(5)48×
5 |
8 |
3 |
8 |
=48×(
5 |
8 |
3 |
8 |
=48×1
=48;
(6)30×(
4 |
5 |
1 |
3 |
1 |
15 |
=30×
4 |
5 |
1 |
3 |
1 |
15 |
=24-10-2
=14-2
=12.
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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