题目内容
计算下列各题.
(1)6÷(0.4÷16)
(2)(
-
)÷(
+
)
(3)360÷15-2.5×1.6
(4)[(4+
)÷
]÷
.
(1)6÷(0.4÷16)
(2)(
| 4 |
| 5 |
| 3 |
| 10 |
| 2 |
| 5 |
| 3 |
| 8 |
(3)360÷15-2.5×1.6
(4)[(4+
| 3 |
| 2 |
| 2 |
| 5 |
| 5 |
| 12 |
考点:小数四则混合运算,分数的四则混合运算
专题:运算顺序及法则
分析:(1、2)先算括号内的,再算括号外的.
(3)先算乘除法,再算减法.
(4)先算小括号內的加法,再算中括号內的除法,最后算中括号外的除法.
(3)先算乘除法,再算减法.
(4)先算小括号內的加法,再算中括号內的除法,最后算中括号外的除法.
解答:
解:(1)6÷(0.4÷16)
=6÷0.025
=240
(2)(
-
)÷(
+
)
=
÷
=
×
=
(3)360÷15-2.5×1.6
=24-4
=20
(4)[(4+
)÷
]÷
=[
×
]÷
=
×
=33
=6÷0.025
=240
(2)(
| 4 |
| 5 |
| 3 |
| 10 |
| 2 |
| 5 |
| 3 |
| 8 |
=
| 5 |
| 10 |
| 31 |
| 40 |
=
| 5 |
| 10 |
| 40 |
| 31 |
=
| 20 |
| 31 |
(3)360÷15-2.5×1.6
=24-4
=20
(4)[(4+
| 3 |
| 2 |
| 2 |
| 5 |
| 5 |
| 12 |
=[
| 11 |
| 2 |
| 5 |
| 2 |
| 5 |
| 12 |
=
| 55 |
| 4 |
| 12 |
| 5 |
=33
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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