题目内容
怎样简便就怎样算.
6÷
|
|
2-
|
(
|
分析:(1)依据先算第二级运算,再算第一级运算,如果只含有同一级运算按照从左到右顺序解答;
(2)(4)运用乘法分配律解答;
(3)运用减法性质解答.
(2)(4)运用乘法分配律解答;
(3)运用减法性质解答.
解答:解:(1)6÷
-
÷6,
=20-
,
=19
;
(2)
×
-
×
,
=(
-
)×
,
=
×
,
=
;
(3)2-
-
,
=2-(
+
),
=2-1,
=1;
(4)(
+
+
)×60,
=
×60+
×60+
×60,
=20+15+12,
=47.
3 |
10 |
3 |
10 |
=20-
1 |
20 |
=19
19 |
20 |
(2)
3 |
4 |
5 |
7 |
3 |
4 |
1 |
7 |
=(
5 |
7 |
1 |
7 |
3 |
4 |
=
4 |
7 |
3 |
4 |
=
3 |
7 |
(3)2-
5 |
11 |
6 |
11 |
=2-(
5 |
11 |
6 |
11 |
=2-1,
=1;
(4)(
1 |
3 |
1 |
4 |
1 |
5 |
=
1 |
3 |
1 |
4 |
1 |
5 |
=20+15+12,
=47.
点评:本题考查知识点:(1)依据四则运算顺序进行计算,(2)正确运用简便算法解决问题.
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