题目内容
计算下面各题,能简便运算的要简便运算.
|
|
1-
| ||||||||||||||||||
|
|
|
分析:(1)(4)按照从左到右顺序解答,
(2)运用加法交换律解答,
(3)依据减法性质解答,
(5)(6)按照先算括号里面的,再算括号外面的顺序解答.
(2)运用加法交换律解答,
(3)依据减法性质解答,
(5)(6)按照先算括号里面的,再算括号外面的顺序解答.
解答:解:(1)
+
-
=
-
=1
;
(2)
-
+
=(
+
)-
=1-
=
;
(3)1-
-
=1-(
+
)
=1-1
=0;
(4)
+
-
=
-
=1
;
(5)
-(
-
)
=
-
=
;
(6)
-(
+
)
=
-
=
.
| 1 |
| 2 |
| 7 |
| 9 |
| 1 |
| 4 |
=
| 23 |
| 18 |
| 1 |
| 4 |
=1
| 1 |
| 36 |
(2)
| 3 |
| 4 |
| 5 |
| 8 |
| 1 |
| 4 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 5 |
| 8 |
=1-
| 5 |
| 8 |
=
| 3 |
| 8 |
(3)1-
| 7 |
| 9 |
| 2 |
| 9 |
=1-(
| 7 |
| 9 |
| 2 |
| 9 |
=1-1
=0;
(4)
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 3 |
=
| 17 |
| 12 |
| 1 |
| 3 |
=1
| 1 |
| 12 |
(5)
| 1 |
| 2 |
| 3 |
| 4 |
| 3 |
| 8 |
=
| 1 |
| 2 |
| 3 |
| 8 |
=
| 1 |
| 8 |
(6)
| 5 |
| 6 |
| 1 |
| 3 |
| 3 |
| 10 |
=
| 5 |
| 6 |
| 19 |
| 30 |
=
| 1 |
| 5 |
点评:本题主要考查学生依据四则混合运算顺序正确进行计算,以及正确运用简便方法解决问题的能力.
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