题目内容

计算下面各题,怎样简便就怎样计算.
0.75×
5
11
+
6
11
×
3
4
0.25×4÷0.25×4
1
10
+
1
17
)×13+4÷17
0.6÷
7
13
+
8
7
×
3
5
-60%
50-7.5-1.3-1.2           
1
2
-
1
3
+
1
6
)×36.
分析:(1)0.75×
5
11
+
6
11
×
3
4
,应用乘法分配律进行简算;
(2)0.25×4÷0.25×4,根据两个相同的数相除商是1,将原式调整为0.25÷0.25×4×4,这样计算简便;
(3)(
1
10
+
1
17
)×13+4÷17,转化为(
1
10
+
1
17
)×13+
4
17
,先应用乘法分配律,再应用加结合律进行简算;
(4)0.6÷
7
13
+
8
7
×
3
5
-60%,转化为0.6×
13
7
+
8
7
×0.6
-0.6,再应用乘法分配律进行简算;
(5)50-7.5-1.3-1.2,根据减法的运算性质进行简算;
(6)(
1
2
-
1
3
+
1
6
)×36,应用乘法分配律进行简算.
解答:解:(1)0.75×
5
11
+
6
11
×
3
4

=0.75×(
5
11
+
6
11
),
=0.75×1,
=0.75;

(2)0.25×4÷0.25×4,
=0.25÷0.25×(4×4),
=1×16,
=16;

(3)(
1
10
+
1
17
)×13+4÷17,
=(
1
10
+
1
17
)×13+
4
17

=
1
10
×
13+
1
17
×
13+
4
17

=1
3
10
+(
13
17
+
4
17
),
=1
3
10
+
1,
=2
3
10


(4)0.6÷
7
13
+
8
7
×
3
5
-60%,
=0.6×
13
7
+
8
7
×0.6
-0.6,
=0.6×(
13
7
+
8
7
-
1),
=0.6×2,
=1.2;

(5)50-7.5-1.3-1.2,
=50-(7.5+1.3+1.2),
=50-10,
=40;

(6)(
1
2
-
1
3
+
1
6
)×36,
=
1
2
×
36-
1
3
×
36+
1
6
×
36,
=18-12+6,
=12.
点评:此题考查灵活运用运算定律和运算性质对小数、分数四则混合运算进行简便计算.
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