题目内容
计算下列各题 ①
|
②[1-(
| ||||||||||||||
③9.6-11÷7+
|
④12×[(
|
分析:(1)运用乘法分配律解答,
(2)(4)依据四则运算计算方法,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序甲数,有括号先算括号里面的解答,
(3)运用加法性质解答.
(2)(4)依据四则运算计算方法,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序甲数,有括号先算括号里面的解答,
(3)运用加法性质解答.
解答:解:①
×
+25%×
+0.25×
,
=(
+
+
)×
,
=
×
,
=
;
②[1-(
+
)]÷
,
=[1-
]÷
,
=
÷
,
=1
;
③9.6-11÷7+
×4,
=9.6+(
-
),
=9.6-1,
=8.6;
④12×[(
-
)×3],
=12×[
×3],
=12×
,
=42.
3 |
7 |
1 |
4 |
2 |
7 |
1 |
7 |
=(
3 |
7 |
2 |
7 |
1 |
7 |
1 |
4 |
=
6 |
7 |
1 |
4 |
=
3 |
14 |
②[1-(
1 |
4 |
3 |
8 |
1 |
4 |
=[1-
5 |
8 |
1 |
4 |
=
3 |
8 |
1 |
4 |
=1
1 |
2 |
③9.6-11÷7+
1 |
7 |
=9.6+(
4 |
7 |
11 |
7 |
=9.6-1,
=8.6;
④12×[(
11 |
6 |
2 |
3 |
=12×[
7 |
6 |
=12×
7 |
2 |
=42.
点评:正确依据四则运算计算方法进行计算,以及正确运用简便算法是解答本题的关键.
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