题目内容
| 用自己喜欢的方法计算. 3.6×(1-20%) |
3-
| ||||||||||||||
|
(
|
分析:①把20%看作0.2计算,
②变成3-(
+
)计算简便,
③利用乘法分配律计算简便,
④利用乘法分配律计算简便.
②变成3-(
| 7 |
| 12 |
| 5 |
| 12 |
③利用乘法分配律计算简便,
④利用乘法分配律计算简便.
解答:解:①3.6×(1-20%),
=3.6×0.8,
=2.88;
②3-
-
,
=3-(
+
),
=3-1,
=2;
③
×
+
×
,
=
×(
+
),
=
×1,
=
;
④(
+
-
)×12,
=
×12+
×12-
×12,
=3+10-4,
=9.
=3.6×0.8,
=2.88;
②3-
| 7 |
| 12 |
| 5 |
| 12 |
=3-(
| 7 |
| 12 |
| 5 |
| 12 |
=3-1,
=2;
③
| 5 |
| 7 |
| 3 |
| 8 |
| 5 |
| 8 |
| 5 |
| 7 |
=
| 5 |
| 7 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 5 |
| 7 |
=
| 5 |
| 7 |
④(
| 1 |
| 4 |
| 5 |
| 6 |
| 1 |
| 3 |
=
| 1 |
| 4 |
| 5 |
| 6 |
| 1 |
| 3 |
=3+10-4,
=9.
点评:此题主要考查分数、整数、小数、百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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