题目内容
(2011?游仙区模拟)计算,能简算的要简算.
43×
|
|
2-
| ||||||||||||||||
|
|
(0.75-
|
分析:(1)把43化成(42+1)的形式,运用乘法分配律进行简算,
(2)把除以
化成乘以
,运用乘法的分配律进行计算,
(3)根据分数出的运算法则计算,
(4)先算除法,再做加法,
(5)运用分数的四则运算顺序计算,把除法化成乘法计算,
(6)先算括号里,再算乘法.
(2)把除以
| 7 |
| 4 |
| 4 |
| 7 |
(3)根据分数出的运算法则计算,
(4)先算除法,再做加法,
(5)运用分数的四则运算顺序计算,把除法化成乘法计算,
(6)先算括号里,再算乘法.
解答:解:(1)43×
,
=(42+1)×
,
=42×
+1×
,
=9+
,
=9
,
(2)
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)2-
÷
-
,
=2-
×
-
,
=2-
-
,
=2-(
+
),
=2-2,
=0;
(4)
+
÷
,
=
+
×
,
=
+
,
=
,
=1
;
(5)
÷
×0.64,
=
×
×0.64,
=1.2;
(6)(0.75-
)×(
+
),
=
×
,
=
.
| 9 |
| 42 |
=(42+1)×
| 9 |
| 42 |
=42×
| 9 |
| 42 |
| 9 |
| 42 |
=9+
| 9 |
| 42 |
=9
| 3 |
| 14 |
(2)
| 4 |
| 7 |
| 5 |
| 9 |
| 4 |
| 9 |
| 7 |
| 4 |
=
| 4 |
| 7 |
| 5 |
| 9 |
| 4 |
| 9 |
| 4 |
| 7 |
=
| 4 |
| 7 |
| 5 |
| 9 |
| 4 |
| 9 |
=
| 4 |
| 7 |
=
| 4 |
| 7 |
(3)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 6 |
| 13 |
| 26 |
| 9 |
| 2 |
| 3 |
=2-
| 4 |
| 3 |
| 2 |
| 3 |
=2-(
| 4 |
| 3 |
| 2 |
| 3 |
=2-2,
=0;
(4)
| 8 |
| 9 |
| 4 |
| 7 |
| 6 |
| 7 |
=
| 8 |
| 9 |
| 4 |
| 7 |
| 7 |
| 6 |
=
| 8 |
| 9 |
| 2 |
| 3 |
=
| 14 |
| 9 |
=1
| 5 |
| 9 |
(5)
| 5 |
| 14 |
| 4 |
| 21 |
=
| 5 |
| 14 |
| 21 |
| 4 |
=1.2;
(6)(0.75-
| 3 |
| 16 |
| 2 |
| 9 |
| 1 |
| 3 |
=
| 9 |
| 16 |
| 5 |
| 9 |
=
| 5 |
| 16 |
点评:考查了分数四则混合运算的顺序计算,能简算要简算.
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