题目内容
计算(能简算的则简算)
6-
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|
|
|
分析:(1)我们运用一个数连续减去两个数,可以用这个数减去这两个数的和进行计算.
(2)、(3)我们运用加法的结合律、交换律进行计算即可.
(4)一个数减去两个数的差,可以用这个数减去被减数加上减数进行解答即可.
(2)、(3)我们运用加法的结合律、交换律进行计算即可.
(4)一个数减去两个数的差,可以用这个数减去被减数加上减数进行解答即可.
解答:解:(1)6-
-
,
=6-(
+
),
=6-1,
=5;
(2)
+
+
,
=(
+
)+
,
=1+
,
=1
;
(3)
-
+
+
,
=(
+
)+(
-
),
=1-0,
=1;
(4)
-(
-
),
=
-
+
,
=(
+
)-
,
=1-
,
=
.
| 3 |
| 11 |
| 8 |
| 11 |
=6-(
| 3 |
| 11 |
| 8 |
| 11 |
=6-1,
=5;
(2)
| 7 |
| 12 |
| 3 |
| 5 |
| 5 |
| 12 |
=(
| 7 |
| 12 |
| 5 |
| 12 |
| 3 |
| 5 |
=1+
| 3 |
| 5 |
=1
| 3 |
| 5 |
(3)
| 4 |
| 9 |
| 2 |
| 5 |
| 5 |
| 9 |
| 2 |
| 5 |
=(
| 4 |
| 9 |
| 5 |
| 9 |
| 2 |
| 5 |
| 2 |
| 5 |
=1-0,
=1;
(4)
| 9 |
| 19 |
| 8 |
| 9 |
| 10 |
| 19 |
=
| 9 |
| 19 |
| 8 |
| 9 |
| 10 |
| 19 |
=(
| 9 |
| 19 |
| 10 |
| 19 |
| 8 |
| 9 |
=1-
| 8 |
| 9 |
=
| 1 |
| 9 |
点评:本题考查了学生对运算定律的掌握与运用情况.
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