题目内容
选择喜欢的方法计算
|
2-
| ||||||||||||||
|
(
|
分析:①②把除法改为乘法,根据运算顺序和运算法则进行计算;③把除法改为乘法,运用乘法分配律简算;④运用乘法分配律进行计算即可.
解答:解;①
×
÷
,
=
×
,
=
;
②2-
÷
-
,
=2-
-
,
=1;
③
÷
+
×
,
=
×
+
×
,
=
×(
+
),
=
×1
=
;
④(
+
-
)×24,
=
×24+
×24-
×24,
=20+14-21,
=13.
| 7 |
| 8 |
| 6 |
| 7 |
| 5 |
| 16 |
=
| 3 |
| 4 |
| 16 |
| 5 |
=
| 12 |
| 5 |
②2-
| 6 |
| 13 |
| 9 |
| 26 |
| 1 |
| 3 |
=2-
| 4 |
| 3 |
| 1 |
| 3 |
=1;
③
| 5 |
| 14 |
| 7 |
| 5 |
| 5 |
| 7 |
| 9 |
| 14 |
=
| 5 |
| 14 |
| 5 |
| 7 |
| 5 |
| 7 |
| 9 |
| 14 |
=
| 5 |
| 7 |
| 5 |
| 14 |
| 9 |
| 14 |
=
| 5 |
| 7 |
=
| 5 |
| 7 |
④(
| 5 |
| 6 |
| 7 |
| 12 |
| 7 |
| 8 |
=
| 5 |
| 6 |
| 7 |
| 12 |
| 7 |
| 8 |
=20+14-21,
=13.
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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