题目内容
脱式计算.
3
+2
-3
×
+
×
÷(
×
+
÷
)
÷7+
×
.
3
4 |
15 |
7 |
15 |
11 |
15 |
8 |
15 |
5 |
6 |
5 |
6 |
2 |
5 |
4 |
5 |
1 |
3 |
5 |
7 |
2 |
3 |
7 |
2 |
8 |
13 |
1 |
7 |
6 |
13 |
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)按照从左到右的顺序计算;
(2)运用乘法分配律简算;
(3)先算小括号里面的乘法和除法,再算小括号里面的加法,最后算括号外的除法;
(4)先把除法变成乘法,再运用乘法分配律简算.
(2)运用乘法分配律简算;
(3)先算小括号里面的乘法和除法,再算小括号里面的加法,最后算括号外的除法;
(4)先把除法变成乘法,再运用乘法分配律简算.
解答:
解:(1)3
+2
-3
=5
-3
=2;
(2)
×
+
×
=(
+
)×
=
×
=
;
(3)
÷(
×
+
÷
)
=
÷(
+
)
=
×
=
;
(4)
÷7+
×
=
×
+
×
=(
+
)×
=
×
=
.
4 |
15 |
7 |
15 |
11 |
15 |
=5
11 |
15 |
11 |
15 |
=2;
(2)
8 |
15 |
5 |
6 |
5 |
6 |
2 |
5 |
=(
8 |
15 |
2 |
5 |
5 |
6 |
=
14 |
15 |
5 |
6 |
=
7 |
9 |
(3)
4 |
5 |
1 |
3 |
5 |
7 |
2 |
3 |
7 |
2 |
=
4 |
5 |
5 |
21 |
4 |
21 |
=
4 |
5 |
21 |
9 |
=
28 |
15 |
(4)
8 |
13 |
1 |
7 |
6 |
13 |
=
8 |
13 |
1 |
7 |
1 |
7 |
6 |
13 |
=(
8 |
13 |
6 |
13 |
1 |
7 |
=
14 |
13 |
1 |
7 |
=
2 |
13 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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