题目内容
用递等式计算．
×
+
×
(
-
)×
72%×
+
×
．
| 7 |
| 9 |
| 3 |
| 5 |
| 7 |
| 9 |
| 2 |
| 5 |
(
| 7 |
| 8 |
| 3 |
| 8 |
| 8 |
| 7 |
72%×
| 5 |
| 24 |
| 7 |
| 25 |
| 5 |
| 24 |
考点：分数的简便计算
专题：运算定律及简算
分析：根据乘法分配律简便计算．
解答：
解：
×
+
×
=
×（
+
）
=
×1
=
；
(
-
)×
=
×
-
×
=1-
=
；
72%×
+
×
=（0.72+0.28）×
=1×
=
．
| 7 |
| 9 |
| 3 |
| 5 |
| 7 |
| 9 |
| 2 |
| 5 |
=
| 7 |
| 9 |
| 3 |
| 5 |
| 2 |
| 5 |
=
| 7 |
| 9 |
=
| 7 |
| 9 |
(
| 7 |
| 8 |
| 3 |
| 8 |
| 8 |
| 7 |
=
| 7 |
| 8 |
| 8 |
| 7 |
| 3 |
| 8 |
| 8 |
| 7 |
=1-
| 3 |
| 7 |
=
| 4 |
| 7 |
72%×
| 5 |
| 24 |
| 7 |
| 25 |
| 5 |
| 24 |
=（0.72+0.28）×
| 5 |
| 24 |
=1×
| 5 |
| 24 |
=
| 5 |
| 24 |
点评：此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算．
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