题目内容
怎样简便怎样算
(68-
|
| ||||||||||
4÷
|
|
分析:(1)运用乘法的分配律进行简算;
(2)小数小括号里的减法,再算在括号里的除法,最后算中括号外的除法;
(3)先同时求出两个除法算式,再算减法;
(4)运用减法的运算定律进行简算.
(2)小数小括号里的减法,再算在括号里的除法,最后算中括号外的除法;
(3)先同时求出两个除法算式,再算减法;
(4)运用减法的运算定律进行简算.
解答:解:(1)(68-
)×
,
=68×
-
×
,
=4-
,
=3
;
(2)
÷[
÷(1-
)],
=
÷[
÷
],
=
÷
,
=
;
(3)4÷
-
÷4,
=5-
,
=4
;
(4)
-
-
,
=
-(
+
),
=
-1,
=
;
| 17 |
| 18 |
| 1 |
| 17 |
=68×
| 1 |
| 17 |
| 17 |
| 18 |
| 1 |
| 17 |
=4-
| 1 |
| 18 |
=3
| 17 |
| 18 |
(2)
| 5 |
| 6 |
| 4 |
| 5 |
| 1 |
| 3 |
=
| 5 |
| 6 |
| 4 |
| 5 |
| 2 |
| 3 |
=
| 5 |
| 6 |
| 6 |
| 5 |
=
| 25 |
| 36 |
(3)4÷
| 4 |
| 5 |
| 4 |
| 5 |
=5-
| 1 |
| 5 |
=4
| 4 |
| 5 |
(4)
| 5 |
| 3 |
| 2 |
| 7 |
| 5 |
| 7 |
=
| 5 |
| 3 |
| 2 |
| 7 |
| 5 |
| 7 |
=
| 5 |
| 3 |
=
| 2 |
| 3 |
点评:考查了分数四则混合运算的顺序,注意灵活运用运算定律进行简算即可.
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