题目内容
脱式计算:
12×(
|
24×
|
| ||||||||||||||
86×
|
|
|
分析:根据分数的四则混合运算顺序进行计算,能用简便方法的可用简便方法计算.
解答:解:①12×(
+
)
=12×
+12×
=8+2
=10;
②24×
-
=
-
=2
;
③
×
÷
=
×
×
=
;
④86×
=(85+1)×
=85×
+1×
=4+
=4
;
⑤
×
+
÷7
=
×
+
×
=(
+
)×
=
×
=
;
⑥
÷(
+
)
=
÷
=
.
2 |
3 |
1 |
6 |
=12×
2 |
3 |
1 |
6 |
=8+2
=10;
②24×
5 |
36 |
3 |
8 |
=
10 |
3 |
3 |
8 |
=2
23 |
24 |
③
7 |
10 |
5 |
16 |
21 |
32 |
=
7 |
10 |
32 |
21 |
5 |
16 |
=
1 |
3 |
④86×
4 |
85 |
=(85+1)×
4 |
85 |
=85×
4 |
85 |
4 |
85 |
=4+
4 |
85 |
=4
4 |
85 |
⑤
9 |
17 |
1 |
7 |
5 |
17 |
=
9 |
17 |
1 |
7 |
5 |
17 |
1 |
7 |
=(
9 |
17 |
5 |
17 |
1 |
7 |
=
14 |
17 |
1 |
7 |
=
2 |
17 |
⑥
2 |
5 |
3 |
4 |
2 |
5 |
=
2 |
5 |
23 |
20 |
=
8 |
23 |
点评:此题主要考查的是分数的四则混合运算和分数的简便计算.
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