题目内容
(2008?武威)计算:(能简便方法的用简便方法计算
14.6-3.43-1.14÷2
+3.9+
+6.1
×101-
×[
-(
-
)].
14.6-3.43-1.14÷2
| 1 |
| 14 |
| 2 |
| 7 |
| 2 |
| 7 |
| 9 |
| 10 |
| 4 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
分析:(1)先算除法,然后根据连续减去两个数,等于减去这两个数的和简算;
(2)运用加法结合律简算;
(3)先算乘法,再算减法;
(4)先去掉小括号,然后运用加法结合律简算,最后算括号外的乘法.
(2)运用加法结合律简算;
(3)先算乘法,再算减法;
(4)先去掉小括号,然后运用加法结合律简算,最后算括号外的乘法.
解答:解:(1)14.6-3.43-1.14÷2,
=14.6-3.43-0.57,
=14.6-(3.43+0.57),
=14.6-4,
=10.6;
(2)
+3.9+
+6.1,
=(
+
)+(6.1+3.9),
=
+10,
=10
;
(3)
×101-
,
=
-
,
=
;
(4)
×[
-(
-
)],
=
×[
-
+
],
=
×[(
+
)-
].
=
×[1-
],
=
×
,
=
.
=14.6-3.43-0.57,
=14.6-(3.43+0.57),
=14.6-4,
=10.6;
(2)
| 1 |
| 14 |
| 2 |
| 7 |
=(
| 1 |
| 14 |
| 2 |
| 7 |
=
| 5 |
| 14 |
=10
| 5 |
| 14 |
(3)
| 2 |
| 7 |
| 9 |
| 10 |
=
| 202 |
| 7 |
| 9 |
| 10 |
=
| 1957 |
| 70 |
(4)
| 4 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 4 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 4 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
| 7 |
| 16 |
=
| 4 |
| 9 |
| 7 |
| 16 |
=
| 4 |
| 9 |
| 9 |
| 16 |
=
| 1 |
| 4 |
点评:运算定律是常用的简便运算的方法,要熟练掌握,灵活运用.
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