题目内容
能简算的要简算
|
| 2-
| ||||||||||||||||||||
|
|
|
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)、(4)、(5)、(6)根据乘法分配律进行简算;
(2)根据除法的性质进行简算;
(3)先算除法,再根据减法的性质进行简算.
(2)根据除法的性质进行简算;
(3)先算除法,再根据减法的性质进行简算.
解答:
解:(1)
×
+
×
=
×(
+
)
=
×1
=
;
(2)
÷
÷
=
÷
÷
=
÷
=16;
(3)2-
÷
-
=2-
-
=2-(
+
)
=2-2
=0;
(4)
×11-
=
×(11-1)
=
×10
=9;
(5)
×
+
÷
=
×
+
×
=(
+
)×
=2×
=
;
(6)
÷7+
×
=
×
+
×
=(
+
)×
=
×
=
.
| 5 |
| 9 |
| 3 |
| 4 |
| 5 |
| 9 |
| 1 |
| 4 |
=
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 5 |
| 9 |
=
| 5 |
| 9 |
(2)
| 3 |
| 5 |
| 1 |
| 20 |
| 3 |
| 4 |
=
| 3 |
| 5 |
| 3 |
| 4 |
| 1 |
| 20 |
=
| 4 |
| 5 |
| 1 |
| 20 |
=16;
(3)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 4 |
| 3 |
| 2 |
| 3 |
=2-(
| 4 |
| 3 |
| 2 |
| 3 |
=2-2
=0;
(4)
| 9 |
| 10 |
| 9 |
| 10 |
=
| 9 |
| 10 |
=
| 9 |
| 10 |
=9;
(5)
| 6 |
| 5 |
| 2 |
| 15 |
| 2 |
| 15 |
| 5 |
| 4 |
=
| 6 |
| 5 |
| 2 |
| 15 |
| 2 |
| 15 |
| 4 |
| 5 |
=(
| 6 |
| 5 |
| 4 |
| 5 |
| 2 |
| 15 |
=2×
| 2 |
| 15 |
=
| 4 |
| 15 |
(6)
| 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 |
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.
练习册系列答案
相关题目