题目内容
计算下面各题,怎样简便就怎样计算. 0.75×
|
0.25×4÷0.25×4 | (
| ||||||||||||
0.6÷
|
50-7.5-1.3-1.2 | (
|
分析:(1)0.75×
+
×
,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)(
+
)×13+4÷17,转化为(
+
)×13+
,先应用乘法分配律,再应用加结合律进行简算;
(4)0.6÷
+
×
-60%,转化为0.6×
+
×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)(
-
+
)×36,应用乘法分配律进行简算.
5 |
11 |
6 |
11 |
3 |
4 |
(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 |
1 |
10 |
1 |
17 |
4 |
17 |
(4)0.6÷
7 |
13 |
8 |
7 |
3 |
5 |
13 |
7 |
8 |
7 |
(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 |
解答:解:(1)0.75×
+
×
,
=0.75×(
+
),
=0.75×1,
=0.75;
(2)0.25×4÷0.25×4,
=0.25÷0.25×(4×4),
=1×16,
=16;
(3)(
+
)×13+4÷17,
=(
+
)×13+
,
=
×13+
×13+
,
=1
+(
+
),
=1
+1,
=2
;
(4)0.6÷
+
×
-60%,
=0.6×
+
×0.6-0.6,
=0.6×(
+
-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)(
-
+
)×36,
=
×36-
×36+
×36,
=18-12+6,
=12.
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 |
=(
1 |
10 |
1 |
17 |
4 |
17 |
=
1 |
10 |
1 |
17 |
4 |
17 |
=1
3 |
10 |
13 |
17 |
4 |
17 |
=1
3 |
10 |
=2
3 |
10 |
(4)0.6÷
7 |
13 |
8 |
7 |
3 |
5 |
=0.6×
13 |
7 |
8 |
7 |
=0.6×(
13 |
7 |
8 |
7 |
=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 |
=
1 |
2 |
1 |
3 |
1 |
6 |
=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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