题目内容
用递等式计算.
+
×
4÷
-
×
÷
.
| 3 |
| 4 |
| 1 |
| 3 |
| 7 |
| 6 |
4÷
| 8 |
| 3 |
| 3 |
| 5 |
| 5 |
| 9 |
| 2 |
| 5 |
| 4 |
| 9 |
分析:(1)按照先算乘法,再算加法的顺序计算;
(2)按照先算除法,再算减法的顺序计算;
(3)把÷
改写成×
,进而先约分再计算.
(2)按照先算除法,再算减法的顺序计算;
(3)把÷
| 4 |
| 9 |
| 9 |
| 4 |
解答:解:(1)
+
×
,
=
+
,
=
;
(2)4÷
-
,
=4×
-
,
=
-
,
=
;
(3)
×
÷
,
=
×
×
,
=
.
| 3 |
| 4 |
| 1 |
| 3 |
| 7 |
| 6 |
=
| 3 |
| 4 |
| 7 |
| 18 |
=
| 41 |
| 36 |
(2)4÷
| 8 |
| 3 |
| 3 |
| 5 |
=4×
| 3 |
| 8 |
| 3 |
| 5 |
=
| 3 |
| 2 |
| 3 |
| 5 |
=
| 9 |
| 10 |
(3)
| 5 |
| 9 |
| 2 |
| 5 |
| 4 |
| 9 |
=
| 5 |
| 9 |
| 2 |
| 5 |
| 9 |
| 4 |
=
| 1 |
| 2 |
点评:此题是考查分数四则混合运算,在没有括号的算式里,要先算乘除法,再算加减法.
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