题目内容

计算下面各题,能简便的要简便计算.
7
11
×
5
8
×
11
10
         
8
9
+
4
27
)×27
7
12
×6+
5
12
×6
4
11
+
2
11
×
11
6
5
18
×
1
4
×
9
10
1
4
+
2
9
)×36
19
100
×
3
8
×50
[4-(
3
4
-
3
8
)]×
4
29
分析:(1)(5)(7)先分子和分母交叉约分,再计算;
(2)(3)(6)运用或逆用乘法分配律简算;
(4)按照先算乘法,再算加法的顺序计算;
(8)先算小括号里面的减法,再算中括号里面的减法,最后算括号外面的乘法.
解答:解:(1)
7
11
×
5
8
×
11
10

=
7
16


(2)(
8
9
+
4
27
)×27,
=
8
9
×27+
4
27
×27,
=24+4,
=28;

(3)
7
12
×6+
5
12
×6,
=(
7
12
+
5
12
)×6,
=6;

(4)
4
11
+
2
11
×
11
6

=
4
11
+
1
3

=
23
33


(5)
5
18
×
1
4
×
9
10

=
1
16


(6)(
1
4
+
2
9
)×36,
=
1
4
×36+
2
9
×36,
=9+8,
=17;

(7)
19
100
×
3
8
×50,
=
57
16


(8)[4-(
3
4
-
3
8
)]×
4
29

=[4-
3
8
4
29

=
29
8
×
4
29

=
1
2
点评:此题主要考查分数四则混合运算,在计算时要注意运算顺序和运算法则,根据数据的特点能简算的要灵活运用所学的运算律进行简便计算.
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