题目内容
计算下面各题,能简算的要简算.
|
|
101×
|
23×
|
分析:(1)把除以7化成乘以
,再运用乘法的分配律进行简算,
(2)先算小括号里的加法,再算中括号里的除法,最后算括号外的除法,
(3)把101化成(102-1),再运用乘法的分配律进行简算,
(4)把14×
化成16×
,再运用乘法的分配律进行简算.
| 1 |
| 7 |
(2)先算小括号里的加法,再算中括号里的除法,最后算括号外的除法,
(3)把101化成(102-1),再运用乘法的分配律进行简算,
(4)把14×
| 16 |
| 39 |
| 14 |
| 39 |
解答:解:(1)
÷7+
×
,
=
×
+
×
,
=(
+
)×
,
=
×
,
=
;
(2)
÷[(
+
)÷
],
=
÷[
÷
],
=
÷
,
=
;
(3)101×
,
=(102-1)×
,
=102×
-1×
,
=99-
,
=98
;
(4)23×
+14×
,
=23×
+16×
,
=(23+16)×
,
=39×
,
=14.
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 6 |
| 13 |
=(
| 8 |
| 13 |
| 6 |
| 13 |
| 1 |
| 7 |
=
| 14 |
| 13 |
| 1 |
| 7 |
=
| 2 |
| 13 |
(2)
| 11 |
| 13 |
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
=
| 11 |
| 13 |
| 11 |
| 8 |
| 5 |
| 8 |
=
| 11 |
| 13 |
| 11 |
| 5 |
=
| 5 |
| 13 |
(3)101×
| 99 |
| 102 |
=(102-1)×
| 99 |
| 102 |
=102×
| 99 |
| 102 |
| 99 |
| 102 |
=99-
| 99 |
| 102 |
=98
| 1 |
| 34 |
(4)23×
| 14 |
| 39 |
| 16 |
| 39 |
=23×
| 14 |
| 39 |
| 14 |
| 39 |
=(23+16)×
| 14 |
| 39 |
=39×
| 14 |
| 39 |
=14.
点评:此题考查了分数四则混合运算的顺序,根据算式的特点,灵活运用运算定律进行简算.
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