题目内容
计算.
13
×
+6
÷16
1
÷
×
÷6
2
÷[(3
-1.5)×1.12]+
(6
-3.75)÷(4
+7.5)×0.02.
13
7 |
8 |
1 |
16 |
1 |
8 |
1
3 |
5 |
8 |
35 |
9 |
14 |
3 |
7 |
2
2 |
3 |
2 |
7 |
2 |
3 |
(6
2 |
3 |
1 |
6 |
分析:(1)先利用除以一个数等于乘以这个数的倒数,然后利用乘法的分配律;
(2)除以一个数等于乘以这个数的倒数,然后进行约分;
(3)(4)先把小数化成分数,然后按分数四则混合运算的顺序计算;
(2)除以一个数等于乘以这个数的倒数,然后进行约分;
(3)(4)先把小数化成分数,然后按分数四则混合运算的顺序计算;
解答:解:(1)13
×
+6
÷16,
=13
×
+6
×
,
=(13
+6
)×
,
=20×
,
=1
;
(2)1
÷
×
÷6
,
=
×
×
×
,
=
;
(3)2
÷[(3
-1.5)×1.12]+
,
=2
÷(
×1.12)+
,
=2
÷(
×
)+
,
=2
÷2+
,
=
+
,
=2;
(4)(6
-3.75)÷(4
+7.5)×0.02,
=(6
-3
)÷(4
+7
)×0.02,
=
÷
×0.02,
=
×0.02,
=0.005.
7 |
8 |
1 |
16 |
1 |
8 |
=13
7 |
8 |
1 |
16 |
1 |
8 |
1 |
16 |
=(13
7 |
8 |
1 |
8 |
1 |
16 |
=20×
1 |
16 |
=1
1 |
4 |
(2)1
3 |
5 |
8 |
35 |
9 |
14 |
3 |
7 |
=
8 |
5 |
35 |
8 |
9 |
14 |
7 |
45 |
=
7 |
10 |
(3)2
2 |
3 |
2 |
7 |
2 |
3 |
=2
2 |
3 |
25 |
14 |
2 |
3 |
=2
2 |
3 |
25 |
14 |
28 |
25 |
2 |
3 |
=2
2 |
3 |
2 |
3 |
=
4 |
3 |
2 |
3 |
=2;
(4)(6
2 |
3 |
1 |
6 |
=(6
2 |
3 |
3 |
4 |
1 |
6 |
1 |
2 |
=
35 |
12 |
70 |
6 |
=
1 |
4 |
=0.005.
点评:此题考查了按分数四则混合运算的顺序计算,计算过程中注意使用简算和分数、小数之间的互化.
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