题目内容
计算.
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12÷
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分析:第(1)(2)题,
+
和
-
,属于同分母分数的加减法计算,只把分子相加减,分母不变;
第(3)(4)题,属于异分母分数的加减法计算,先通分再计算;
第(5)(6)题属于分数乘整数、整数除以分数的计算,除以一个数等于乘以这个数的倒数,同时注意约分;
第(7)(8)题是分数乘分数、分数除以分数的计算,注意约分.
| 1 |
| 8 |
| 5 |
| 8 |
| 7 |
| 6 |
| 5 |
| 6 |
第(3)(4)题,属于异分母分数的加减法计算,先通分再计算;
第(5)(6)题属于分数乘整数、整数除以分数的计算,除以一个数等于乘以这个数的倒数,同时注意约分;
第(7)(8)题是分数乘分数、分数除以分数的计算,注意约分.
解答:解:(1)
+
,
=
,
=
;
(2)
-
,
=
,
=
;
(3)
+
,
=
+
,
=
;
(4)
-
,
=
-
,
=
;
(5)
×26=16;
(6)12÷
,
=12×
,
=9;
(7)
×
,
=
,
=
;
(8)
÷
,
=
×
,
=2.
| 1 |
| 8 |
| 5 |
| 8 |
=
| 6 |
| 8 |
=
| 3 |
| 4 |
(2)
| 7 |
| 6 |
| 5 |
| 6 |
=
| 2 |
| 6 |
=
| 1 |
| 3 |
(3)
| 1 |
| 3 |
| 3 |
| 5 |
=
| 5 |
| 15 |
| 9 |
| 15 |
=
| 14 |
| 15 |
(4)
| 3 |
| 4 |
| 2 |
| 5 |
=
| 15 |
| 20 |
| 8 |
| 20 |
=
| 7 |
| 20 |
(5)
| 8 |
| 13 |
(6)12÷
| 4 |
| 3 |
=12×
| 3 |
| 4 |
=9;
(7)
| 3 |
| 10 |
| 5 |
| 9 |
=
| 3×5 |
| 10×9 |
=
| 1 |
| 6 |
(8)
| 5 |
| 4 |
| 5 |
| 8 |
=
| 5 |
| 4 |
| 8 |
| 5 |
=2.
点评:此题考查了同分母分数相加减、异分母分数相加减、分数乘整数、整数除以分数以及分数乘分数、分数除以分数的计算,在做题时注意约分.
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