题目内容
能简算的要简算.
| 15×(1.5-
| ||||||||||||
|
|
考点:分数的四则混合运算
专题:
分析:(1)根据乘法分配律进行简算;
(2)先算减法,再算乘法,最后算除法;
(3)先算除法,再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.
(2)先算减法,再算乘法,最后算除法;
(3)先算除法,再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.
解答:
解:(1)
-
×
=
×(1-
)
=
×
=
;
(2)15×(1.5-
)÷
=15×
÷
=
÷
=50;
(3)
+
÷
+
=
+
+
=1+
=1
;
(4)
÷5+
÷2
=
×
+
×
=
×(
+
)
=
×
=
.
| 4 |
| 7 |
| 4 |
| 7 |
| 3 |
| 4 |
=
| 4 |
| 7 |
| 3 |
| 4 |
=
| 4 |
| 7 |
| 1 |
| 4 |
=
| 1 |
| 7 |
(2)15×(1.5-
| 2 |
| 3 |
| 1 |
| 4 |
=15×
| 5 |
| 6 |
| 1 |
| 4 |
=
| 25 |
| 2 |
| 1 |
| 4 |
=50;
(3)
| 1 |
| 7 |
| 5 |
| 7 |
| 5 |
| 6 |
| 5 |
| 12 |
=
| 1 |
| 7 |
| 6 |
| 7 |
| 5 |
| 12 |
=1+
| 5 |
| 12 |
=1
| 5 |
| 12 |
(4)
| 7 |
| 8 |
| 7 |
| 8 |
=
| 7 |
| 8 |
| 1 |
| 5 |
| 7 |
| 8 |
| 1 |
| 2 |
=
| 7 |
| 8 |
| 1 |
| 5 |
| 1 |
| 2 |
=
| 7 |
| 8 |
| 7 |
| 10 |
=
| 49 |
| 80 |
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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