题目内容
怎样简便怎样算.
|
18.8-
|
(1-
| ||||||||||||||||
24×(
|
58÷4+0.25×41+
|
|
分析:
(1-
×
)÷
直接根据分数四则运算的顺序计算;
÷(4-
-
)括号内进行简算,再根据分数四则运算的法则计算.
24×(
|
||||||||||||
18.8-
58÷4+0.25×41+
|
| 3 |
| 4 |
| 4 |
| 5 |
| 8 |
| 15 |
| 1 |
| 12 |
| 7 |
| 15 |
| 8 |
| 15 |
解答:
18.8-
-3.8-
,
=18.8-3.8-(
+
),
=15-1,
=14;
58÷4+0.25×41+
,
=58×
+
×41+
,
=(58+41+1)×
,
=100×
,
=25;
(1-
×
)÷
,
=(1-
)÷
,
=
×
,
=
;
÷(4-
-
),
=
÷[4-(
+
)],
=
÷[4-1],
=
×
,
=
.
解:
=(
=1×
=
|
||||||||||||||||||
24×(
24×
=15+20, =35; |
| 2 |
| 3 |
| 1 |
| 3 |
=18.8-3.8-(
| 2 |
| 3 |
| 1 |
| 3 |
=15-1,
=14;
58÷4+0.25×41+
| 1 |
| 4 |
=58×
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
=(58+41+1)×
| 1 |
| 4 |
=100×
| 1 |
| 4 |
=25;
(1-
| 3 |
| 4 |
| 4 |
| 5 |
| 8 |
| 15 |
=(1-
| 3 |
| 5 |
| 8 |
| 15 |
=
| 2 |
| 5 |
| 15 |
| 8 |
=
| 3 |
| 4 |
| 1 |
| 12 |
| 7 |
| 15 |
| 8 |
| 15 |
=
| 1 |
| 12 |
| 7 |
| 15 |
| 8 |
| 15 |
=
| 1 |
| 12 |
=
| 1 |
| 12 |
| 1 |
| 3 |
=
| 1 |
| 36 |
点评:此题主要考查根据整数乘法分配律、减法的运算性质进行分数的简便计算.
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