题目内容

计算下面各题.
(
3
4
+
7
9
)×36
1
4
+
2
3
×
1
2
13
15
×
3
7
×14
1
2
×(
5
6
-
2
3
)
5
7
+
2
7
×
1
2
2
3
×
3
4
-
2
3
×
1
4
分析:(1)运用乘法分配律简算;
(2)(5)先算乘法,再算加法;
(3)(6)运用乘法结合律简算;
(4)先算括号内的,再算括号外的.
解答:解:(1)(
3
4
+
7
9
)×36,
=
3
4
×36+
7
9
×36,
=27+28,
=55;

(2)
1
4
+
2
3
×
1
2

=
1
4
+
1
3

=
7
12


(3)
13
15
×
3
7
×14,
=
13
15
×(
3
7
×14),
=
13
15
×6,
=
26
5


(4)
1
2
×(
5
6
-
2
3
),
=
1
2
×
1
6

=
1
12


(5)
5
7
+
2
7
×
1
2

=
5
7
+
1
7

=
6
7


(6)
2
3
×
3
4
-
2
3
×
1
4

=
2
3
×(
3
4
-
1
4
),
=
2
3
×
1
2

=
1
3
点评:此题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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