题目内容
下面各题,怎样算简便就怎样算.
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分析:(1)先算括号里面的减法,再算乘法,
(2)根据乘法分配律进行计算,
(3)根据加法交换律和减法的性质进行计算,
(4)先算括号里面的减法,再算乘法,最后算加法.据此解答.
(2)根据乘法分配律进行计算,
(3)根据加法交换律和减法的性质进行计算,
(4)先算括号里面的减法,再算乘法,最后算加法.据此解答.
解答:解:(1)(
-
)×
,
=
×
,
=
;
(2)
×
+
×
,
=
×(
+
),
=
×
,
=
;
(3)
-
+
-
,
=
+
-
-
,
=(
+
)-(
+
),
=
-1,
=
;
(4)
+(
-
)×
,
=
+
×
,
=
+
,
=
.
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 20 |
=
| 1 |
| 20 |
| 1 |
| 20 |
=
| 1 |
| 400 |
(2)
| 3 |
| 4 |
| 5 |
| 6 |
| 5 |
| 6 |
| 3 |
| 4 |
=
| 3 |
| 4 |
| 5 |
| 6 |
| 5 |
| 6 |
=
| 3 |
| 4 |
| 10 |
| 6 |
=
| 5 |
| 4 |
(3)
| 8 |
| 13 |
| 4 |
| 7 |
| 6 |
| 13 |
| 3 |
| 7 |
=
| 8 |
| 13 |
| 6 |
| 13 |
| 3 |
| 7 |
| 4 |
| 7 |
=(
| 8 |
| 13 |
| 6 |
| 13 |
| 3 |
| 7 |
| 4 |
| 7 |
=
| 14 |
| 13 |
=
| 1 |
| 13 |
(4)
| 2 |
| 3 |
| 4 |
| 5 |
| 2 |
| 3 |
| 5 |
| 3 |
=
| 2 |
| 3 |
| 2 |
| 15 |
| 5 |
| 3 |
=
| 2 |
| 3 |
| 2 |
| 9 |
=
| 8 |
| 9 |
点评:本题综合考查了学生的计算能力,以及在计算中合理运用简便算法的能力.
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