题目内容
怎样简便怎样计算 ①
|
②
|
③﹙
| ||||||||||||||||||
④37×
|
⑤﹙4-
|
⑥0.75×46+
|
分析:(1)(2)(5)依据四则运算顺序计算方法解答,
(3)(4)(6)依据乘法分配律解答.
(3)(4)(6)依据乘法分配律解答.
解答:解;(1)
÷
×
,
=
×
,
=
;
(2)
-
÷0.3,
=
-
,
=
;
(3)﹙
-
﹢
﹚÷
,
=
×60-
×60+
×60,
=44-48+21,
=65-48,
=17;
(4)37×
,
=(36+1)×
,
=36×
+1×
,
=35+
,
=35
;
(5)﹙4-
÷
﹚÷0.1,
=(4-2.5)÷0.1,
=1.5÷0.1,
=15;
(6)0.75×46+
×55-3÷4,
=
×(46+55-1),
=
×100,
=75.
6 |
13 |
5 |
11 |
5 |
6 |
=
66 |
65 |
5 |
6 |
=
11 |
13 |
(2)
7 |
15 |
2 |
15 |
=
7 |
15 |
4 |
9 |
=
1 |
45 |
(3)﹙
11 |
15 |
4 |
5 |
7 |
20 |
1 |
60 |
=
11 |
15 |
4 |
5 |
7 |
20 |
=44-48+21,
=65-48,
=17;
(4)37×
35 |
36 |
=(36+1)×
35 |
36 |
=36×
35 |
36 |
35 |
36 |
=35+
35 |
36 |
=35
35 |
36 |
(5)﹙4-
5 |
12 |
1 |
6 |
=(4-2.5)÷0.1,
=1.5÷0.1,
=15;
(6)0.75×46+
3 |
4 |
=
3 |
4 |
=
3 |
4 |
=75.
点评:本题主要考查学生对于分数四则运算计算方法,以及乘法分配律知识的掌握,还要注意在计算中能约分的要约分.
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