题目内容
| 简算 24×(
|
|
|
| ||||||||||||||||||||||||||||||||
|
|
| 11×39×(
|
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)、(2)、(3)、(4)、(5)、(7)、(8)根据乘法分配律进行简算;
(6)先算乘法,再根据加法结合律进行简算.
(6)先算乘法,再根据加法结合律进行简算.
解答:
解:(1)24×(
+
)
=24×
+24×
=4+3
=7;
(2)
×
+
÷
=
×
+
×
=
×(
+
)
=
×1
=
;
(3)
×
+
×
=
×
+
×
=(
+
)×
=
×
=
;
(4)
×
-
×
+
×
=
×
-
×
+
×
=
×(
-
+
)
=
×1
=
;
(5)
×
+
÷9
=
×
+
×
=(
+
)×
=4×
=
;
(6)
+
×
+
=
+
+
=
+(
+
)
=
+6
=11
;
(7)
×
+
×
+
×
=
×
+
×
+
×
=(
+
+
)×
=
×
=
;
(8)11×39×(
+
)
=11×39×
+11×39×
=297+273
=570.
| 1 |
| 6 |
| 1 |
| 8 |
=24×
| 1 |
| 6 |
| 1 |
| 8 |
=4+3
=7;
(2)
| 4 |
| 9 |
| 5 |
| 7 |
| 2 |
| 7 |
| 9 |
| 4 |
=
| 4 |
| 9 |
| 5 |
| 7 |
| 2 |
| 7 |
| 4 |
| 9 |
=
| 4 |
| 9 |
| 5 |
| 7 |
| 2 |
| 7 |
=
| 4 |
| 9 |
=
| 4 |
| 9 |
(3)
| 4 |
| 9 |
| 5 |
| 11 |
| 5 |
| 9 |
| 7 |
| 11 |
=
| 4 |
| 9 |
| 5 |
| 11 |
| 7 |
| 9 |
| 5 |
| 11 |
=(
| 4 |
| 9 |
| 7 |
| 9 |
| 5 |
| 11 |
=
| 11 |
| 9 |
| 5 |
| 11 |
=
| 5 |
| 9 |
(4)
| 1 |
| 9 |
| 9 |
| 10 |
| 1 |
| 9 |
| 3 |
| 10 |
| 4 |
| 9 |
| 1 |
| 10 |
=
| 1 |
| 9 |
| 9 |
| 10 |
| 1 |
| 9 |
| 3 |
| 10 |
| 1 |
| 9 |
| 4 |
| 10 |
=
| 1 |
| 9 |
| 9 |
| 10 |
| 3 |
| 10 |
| 4 |
| 10 |
=
| 1 |
| 9 |
=
| 1 |
| 9 |
(5)
| 19 |
| 5 |
| 1 |
| 9 |
| 1 |
| 5 |
=
| 19 |
| 5 |
| 1 |
| 9 |
| 1 |
| 5 |
| 1 |
| 9 |
=(
| 19 |
| 5 |
| 1 |
| 5 |
| 1 |
| 9 |
=4×
| 1 |
| 9 |
=
| 4 |
| 9 |
(6)
| 41 |
| 7 |
| 10 |
| 3 |
| 7 |
| 4 |
| 1 |
| 6 |
=
| 41 |
| 7 |
| 35 |
| 6 |
| 1 |
| 6 |
=
| 41 |
| 7 |
| 35 |
| 6 |
| 1 |
| 6 |
=
| 41 |
| 7 |
=11
| 6 |
| 7 |
(7)
| 5 |
| 6 |
| 1 |
| 13 |
| 5 |
| 9 |
| 2 |
| 13 |
| 5 |
| 18 |
| 6 |
| 13 |
=
| 1 |
| 6 |
| 5 |
| 13 |
| 2 |
| 9 |
| 5 |
| 13 |
| 6 |
| 18 |
| 5 |
| 13 |
=(
| 1 |
| 6 |
| 2 |
| 9 |
| 6 |
| 18 |
| 5 |
| 13 |
=
| 13 |
| 18 |
| 5 |
| 13 |
=
| 5 |
| 18 |
(8)11×39×(
| 9 |
| 13 |
| 7 |
| 11 |
=11×39×
| 9 |
| 13 |
| 7 |
| 11 |
=297+273
=570.
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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