题目内容
脱式计算
÷
÷
+
×
+
(
-
)×
÷
×
.
2 |
5 |
1 |
5 |
8 |
9 |
1 |
7 |
7 |
8 |
5 |
7 |
3 |
8 |
(
2 |
3 |
1 |
5 |
15 |
2 |
5 |
6 |
7 |
9 |
1 |
18 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(4)把除法变为乘法,约分计算.
(2)先算乘法,再运用加法结合律简算.
(3)先算括号内的,再算括号外的.
(2)先算乘法,再运用加法结合律简算.
(3)先算括号内的,再算括号外的.
解答:
解:(1)
÷
÷
=
×5×
=
(2)
+
×
+
=
+
+
=
+(
+
)
=
+1
=1
(3)(
-
)×
=
×
=
(4)
÷
×
=
×
×
=
2 |
5 |
1 |
5 |
8 |
9 |
=
2 |
5 |
9 |
8 |
=
9 |
4 |
(2)
1 |
7 |
7 |
8 |
5 |
7 |
3 |
8 |
=
1 |
7 |
5 |
8 |
3 |
8 |
=
1 |
7 |
5 |
8 |
3 |
8 |
=
1 |
7 |
=1
1 |
7 |
(3)(
2 |
3 |
1 |
5 |
15 |
2 |
=
7 |
15 |
15 |
2 |
=
7 |
2 |
(4)
5 |
6 |
7 |
9 |
1 |
18 |
=
5 |
6 |
9 |
7 |
1 |
18 |
=
5 |
84 |
点评:考查了分数的四则混合运算,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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