题目内容
计算下面各题,注意使用简便方法.
×
+
+
×
+
×
÷7+
×
24×(
-
)
| 5 |
| 6 |
| 3 |
| 5 |
| 4 |
| 7 |
| 3 |
| 7 |
| 5 |
| 8 |
| 5 |
| 9 |
| 3 |
| 8 |
| 5 |
| 9 |
| 13 |
| 10 |
| 13 |
| 10 |
| 6 |
| 7 |
24×(
| 5 |
| 6 |
| 5 |
| 8 |
分析:(1)根据加法结合律进行简算;
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算.
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算.
解答:解:
(1)
×
+
+
=
×
+(
+
)
=
+1
=1
;
(2)
×
+
×
=(
+
)×
=1×
=
;
(3)
÷7+
×
=
×
+
×
=
×(
+
)
=
×1
=
;
(4)24×(
-
)
=24×
-24×
=20-15
=5.
(1)
| 5 |
| 6 |
| 3 |
| 5 |
| 4 |
| 7 |
| 3 |
| 7 |
=
| 5 |
| 6 |
| 3 |
| 5 |
| 4 |
| 7 |
| 3 |
| 7 |
=
| 1 |
| 2 |
=1
| 1 |
| 2 |
(2)
| 5 |
| 8 |
| 5 |
| 9 |
| 3 |
| 8 |
| 5 |
| 9 |
=(
| 5 |
| 8 |
| 3 |
| 8 |
| 5 |
| 9 |
=1×
| 5 |
| 9 |
=
| 5 |
| 9 |
(3)
| 13 |
| 10 |
| 13 |
| 10 |
| 6 |
| 7 |
=
| 13 |
| 10 |
| 1 |
| 7 |
| 13 |
| 10 |
| 6 |
| 7 |
=
| 13 |
| 10 |
| 1 |
| 7 |
| 6 |
| 7 |
=
| 13 |
| 10 |
=
| 13 |
| 10 |
(4)24×(
| 5 |
| 6 |
| 5 |
| 8 |
=24×
| 5 |
| 6 |
| 5 |
| 8 |
=20-15
=5.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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