题目内容
(2009?菏泽)直接写出得数.
75÷4÷2.5=
5.6×
+1.4×
=
÷
÷
=
1÷
-
=
×
÷
×
=
75÷4÷2.5=
5.6×
| 4 |
| 7 |
| 4 |
| 7 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 6 |
1÷
| 1 |
| 7 |
| 1 |
| 7 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
分析:(1)75÷4÷2.5,运用除法的运算性质进行简算;
(2)5.6×
+1.4×
,运用乘法分配律进行简算;
(3)
÷
÷
,按照分数除法的计算法则进行计算;
(4)1÷
-
,按照分数四则混合运算的运算顺序和分数四则运算的计算法则进行简算;
(5)
×
÷
×
,按照分数乘、除混合运算的计算法则进行简算.
(2)5.6×
| 4 |
| 7 |
| 4 |
| 7 |
(3)
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 6 |
(4)1÷
| 1 |
| 7 |
| 1 |
| 7 |
(5)
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
解答:解:75÷4÷2.5=7.5;
5.6×
+1.4×
=4;
÷
÷
=6;
1÷
-
=6
;
×
÷
×
=
.
5.6×
| 4 |
| 7 |
| 4 |
| 7 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 6 |
1÷
| 1 |
| 7 |
| 1 |
| 7 |
| 6 |
| 7 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
| 9 |
| 16 |
点评:此题考查的目的是灵活应用运算定律和运算性质进行简便计算.
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