题目内容
在每个蒙古包的门上都有一张写有数学题的纸条,只有做对了这道题才可以进入蒙古包.

分析:(1)(8)(9)将除法变为乘法,再约分计算即可;
(2)先算乘,再算加;
(3)将式子变形为
÷
÷
,再计算即可求解;
(4)先算小括号里面的加法,再计算括号外面的乘法;
(5)先算小括号里面的减法,再计算括号外面的乘法;
(6)先算除,再算减;
(7)根据分数除法法则计算即可求解.
(2)先算乘,再算加;
(3)将式子变形为
| 5 |
| 16 |
| 5 |
| 16 |
| 2 |
| 3 |
(4)先算小括号里面的加法,再计算括号外面的乘法;
(5)先算小括号里面的减法,再计算括号外面的乘法;
(6)先算除,再算减;
(7)根据分数除法法则计算即可求解.
解答:解:(1)
×8÷
=
×8×
=
;
(2)
+
×
=
+
=
;
(3)
÷
÷
=
÷
÷
=1÷
=
;
(4)(
+
)×
=
×
=
;
(5)(
-
)×
=
×
=
;
(6)1-
÷
=1-
=
;
(7)
÷5=
;
(8)
÷0.6÷
=
×
×
=1;
(9)
×
÷
=
×
×
=
.
| 1 |
| 15 |
| 4 |
| 5 |
=
| 1 |
| 15 |
| 5 |
| 4 |
=
| 2 |
| 3 |
(2)
| 3 |
| 15 |
| 1 |
| 2 |
| 4 |
| 15 |
=
| 3 |
| 15 |
| 2 |
| 15 |
=
| 1 |
| 3 |
(3)
| 5 |
| 16 |
| 2 |
| 3 |
| 5 |
| 16 |
=
| 5 |
| 16 |
| 5 |
| 16 |
| 2 |
| 3 |
=1÷
| 2 |
| 3 |
=
| 3 |
| 2 |
(4)(
| 5 |
| 8 |
| 5 |
| 6 |
| 4 |
| 25 |
=
| 35 |
| 24 |
| 4 |
| 25 |
=
| 7 |
| 30 |
(5)(
| 5 |
| 6 |
| 2 |
| 3 |
| 9 |
| 20 |
=
| 1 |
| 6 |
| 9 |
| 20 |
=
| 3 |
| 40 |
(6)1-
| 7 |
| 19 |
| 7 |
| 8 |
=1-
| 8 |
| 19 |
=
| 11 |
| 19 |
(7)
| 15 |
| 16 |
| 3 |
| 16 |
(8)
| 18 |
| 35 |
| 6 |
| 7 |
=
| 18 |
| 35 |
| 5 |
| 3 |
| 7 |
| 6 |
=1;
(9)
| 8 |
| 18 |
| 15 |
| 16 |
| 5 |
| 6 |
=
| 8 |
| 18 |
| 15 |
| 16 |
| 6 |
| 5 |
=
| 1 |
| 2 |
点评:考查了运算定律与简便运算,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定律简便计算.
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