题目内容
脱式计算.(能简算的要简算)
(1)60+60×15%
(2)(1-
-32%)÷1%
(3)
×
+60%×
(4)
÷(
+
)
(5)(
+
)×24×
.
(1)60+60×15%
(2)(1-
| 9 |
| 20 |
(3)
| 3 |
| 5 |
| 8 |
| 17 |
| 9 |
| 17 |
(4)
| 14 |
| 25 |
| 1 |
| 2 |
| 1 |
| 5 |
(5)(
| 1 |
| 6 |
| 1 |
| 8 |
| 1 |
| 7 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先计算60与15%的积,再用60加上即可.
(2)把分数化成百分数,然后再进行计算即可.
(3)(5)运用乘法的分配律进行计算即可.
(4)按照四则混合运算的顺序进行计算,先计算小括号内部的加法,再计算除法,由此进行计算即可.
(2)把分数化成百分数,然后再进行计算即可.
(3)(5)运用乘法的分配律进行计算即可.
(4)按照四则混合运算的顺序进行计算,先计算小括号内部的加法,再计算除法,由此进行计算即可.
解答:
解:(1)60+60×15%
=60×(1+15%)
=60×1.15
=69
(2)(1-
-32%)÷1%
=(1-45%-32%)÷1%
=23%÷1%
=23
(3)
×
+60%×
=
×
+
×
=
×(
+
)
=
×1
=
(4)
÷(
+
)
=
÷
=
×
=
(5)(
+
)×24×
=(24×
+
×24)×
=(4+3)×
=1
=60×(1+15%)
=60×1.15
=69
(2)(1-
| 9 |
| 20 |
=(1-45%-32%)÷1%
=23%÷1%
=23
(3)
| 3 |
| 5 |
| 8 |
| 17 |
| 9 |
| 17 |
=
| 3 |
| 5 |
| 8 |
| 17 |
| 3 |
| 5 |
| 9 |
| 17 |
=
| 3 |
| 5 |
| 8 |
| 17 |
| 9 |
| 17 |
=
| 3 |
| 5 |
=
| 3 |
| 5 |
(4)
| 14 |
| 25 |
| 1 |
| 2 |
| 1 |
| 5 |
=
| 14 |
| 25 |
| 7 |
| 10 |
=
| 14 |
| 25 |
| 10 |
| 7 |
=
| 4 |
| 5 |
(5)(
| 1 |
| 6 |
| 1 |
| 8 |
| 1 |
| 7 |
=(24×
| 1 |
| 6 |
| 1 |
| 8 |
| 1 |
| 7 |
=(4+3)×
| 1 |
| 7 |
=1
点评:本题考查了学生对分数四则混合运题目进行简算的能力及对运算顺序掌握的情况.
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