题目内容
能简算的要简算.
| (
|
| ||||||||||||||||
(
| (2-0.6)×
|
|
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)按照从左向右的顺序进行计算;
(2)根据乘法分配律进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据乘法分配律进行简算;
(5)先算减法,再算乘法;
(6)按照从左向右的顺序进行计算.
(2)根据乘法分配律进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据乘法分配律进行简算;
(5)先算减法,再算乘法;
(6)按照从左向右的顺序进行计算.
解答:
解:(1)
÷
÷
=
÷
=
;
(2)(
+
)÷
=(
+
)×
=
×
+
×
=
+1
=
;
(3)
÷0.2×
=
×
=
;
(4)(
+
)×
=
×
+
×
=
+
=
;
(5)(2-0.6)×
=1.4×
=
;
(6)
×
÷
=
÷
=
.
| 3 |
| 4 |
| 7 |
| 8 |
| 15 |
| 14 |
=
| 6 |
| 7 |
| 15 |
| 14 |
=
| 4 |
| 5 |
(2)(
| 4 |
| 9 |
| 2 |
| 15 |
| 2 |
| 15 |
=(
| 4 |
| 9 |
| 2 |
| 15 |
| 15 |
| 2 |
=
| 4 |
| 9 |
| 15 |
| 2 |
| 2 |
| 15 |
| 15 |
| 2 |
=
| 10 |
| 3 |
=
| 13 |
| 3 |
(3)
| 3 |
| 20 |
| 2 |
| 3 |
=
| 3 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 2 |
(4)(
| 5 |
| 8 |
| 5 |
| 6 |
| 4 |
| 25 |
=
| 5 |
| 8 |
| 4 |
| 25 |
| 5 |
| 6 |
| 4 |
| 25 |
=
| 1 |
| 10 |
| 2 |
| 15 |
=
| 7 |
| 30 |
(5)(2-0.6)×
| 7 |
| 15 |
=1.4×
| 7 |
| 15 |
=
| 49 |
| 75 |
(6)
| 4 |
| 9 |
| 5 |
| 16 |
| 5 |
| 6 |
=
| 5 |
| 36 |
| 5 |
| 6 |
=
| 1 |
| 6 |
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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