题目内容
用递等式计算,能简算的要简算.
36×(
+
+
)
÷5+5÷
4.75×
+4.75÷
÷
÷
×24×
(
+
)÷
.
36×(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 9 |
| 5 |
| 7 |
| 5 |
| 7 |
4.75×
| 4 |
| 7 |
| 7 |
| 3 |
| 3 |
| 4 |
| 7 |
| 8 |
| 5 |
| 14 |
| 11 |
| 18 |
| 9 |
| 22 |
(
| 4 |
| 9 |
| 2 |
| 15 |
| 8 |
| 15 |
分析:(1)(3)根据乘法分配律简便计算;
(2)先算除法,再算加法;
(4)将除法变为乘法,再约分计算即可;
(5)约分计算即可;
(6)先计算小括号里面的加法,再算小括号外面的除法.
(2)先算除法,再算加法;
(4)将除法变为乘法,再约分计算即可;
(5)约分计算即可;
(6)先计算小括号里面的加法,再算小括号外面的除法.
解答:解:36×(
+
+
),
=36×
+36×
+36×
,
=9+6+4,
=19;
÷5+5÷
=
+7,
=7
;
4.75×
+4.75÷
,
=4.75×
+4.75×
,
=4.75×(
+
),
=4.75×1,
=4.75;
÷
÷
,
=
×
×
,
=
;
×24×
=6;
(
+
)÷
=
×
,
=
.
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 9 |
=36×
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 9 |
=9+6+4,
=19;
| 5 |
| 7 |
| 5 |
| 7 |
=
| 1 |
| 7 |
=7
| 1 |
| 7 |
4.75×
| 4 |
| 7 |
| 7 |
| 3 |
=4.75×
| 4 |
| 7 |
| 3 |
| 7 |
=4.75×(
| 4 |
| 7 |
| 3 |
| 7 |
=4.75×1,
=4.75;
| 3 |
| 4 |
| 7 |
| 8 |
| 5 |
| 14 |
=
| 3 |
| 4 |
| 8 |
| 7 |
| 14 |
| 5 |
=
| 12 |
| 5 |
| 11 |
| 18 |
| 9 |
| 22 |
(
| 4 |
| 9 |
| 2 |
| 15 |
| 8 |
| 15 |
=
| 26 |
| 45 |
| 15 |
| 8 |
=
| 13 |
| 12 |
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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