题目内容
| 计算下面各题(能简算的要写出简算过程). ①96×
|
②24×(
| ||||||||||||
③
|
④(0.5-
|
分析:①把96变成(95+1)把原算式变成(95+1)×
利用乘法分配律计算简便;
②利用乘法分配律把原算式变成24×
+24×
+24×
;
③把
÷5变成
×
,把原算式变成(
+
)×
计算简便;
④(0.5-
)变成
-
,两个括号同时计算.
| 3 |
| 95 |
②利用乘法分配律把原算式变成24×
| 3 |
| 8 |
| 1 |
| 6 |
| 5 |
| 12 |
③把
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
④(0.5-
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
解答:解:①96×
,
=(95+1)×
,
=95×
+1×
,
=3+
,
=3
,
②24×(
+
+
),
=24×
+24×
+24×
,
=9+4+10,
=23;
③
÷5+
×
,
=
×
+
×
,
=
×(
+
),
=
;
④(0.5-
)÷(
+
),
=(
-
)÷(
+
),
=
÷
,
=
.
| 3 |
| 95 |
=(95+1)×
| 3 |
| 95 |
=95×
| 3 |
| 95 |
| 3 |
| 95 |
=3+
| 3 |
| 95 |
=3
| 3 |
| 95 |
②24×(
| 3 |
| 8 |
| 1 |
| 6 |
| 5 |
| 12 |
=24×
| 3 |
| 8 |
| 1 |
| 6 |
| 5 |
| 12 |
=9+4+10,
=23;
③
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 3 |
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 5 |
| 1 |
| 3 |
| 2 |
| 3 |
=
| 1 |
| 5 |
④(0.5-
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
=(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 6 |
| 7 |
| 12 |
=
| 2 |
| 7 |
点评:此题考查运算定律与简便计算,四则运算的法则和顺序,四则运算注意运算顺序和法则,灵活运用所学的运算定律进行简便运算.
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