题目内容
计算下列各题.
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考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)直接约分计算即可;
(2)直接约分计算即可;
(3)运用除法的性质进行简算;
(4)直接约分计算即可;
(5)把除法化成乘法,再直接约分计算即可;
(6)把除法化成乘法,再直接约分计算即可.
(2)直接约分计算即可;
(3)运用除法的性质进行简算;
(4)直接约分计算即可;
(5)把除法化成乘法,再直接约分计算即可;
(6)把除法化成乘法,再直接约分计算即可.
解答:
解:(1)
×
×
=
=
;
(2)
×
×
=
=
;
(3)
÷6÷
=
÷(6×
)
=
÷3
=
;
(4)
×
×
=
=
;
(5)
×
÷
=
×
×
=
=
;
(6)
×
÷
=
×
×
=
=
.
| 9 |
| 14 |
| 14 |
| 15 |
| 5 |
| 9 |
=
| 9×14×5 |
| 14×15×9 |
=
| 1 |
| 3 |
(2)
| 5 |
| 8 |
| 5 |
| 4 |
| 16 |
| 15 |
=
| 5×5×16 |
| 8×4×15 |
=
| 15 |
| 2 |
(3)
| 6 |
| 13 |
| 1 |
| 2 |
=
| 6 |
| 13 |
| 1 |
| 2 |
=
| 6 |
| 13 |
=
| 2 |
| 13 |
(4)
| 7 |
| 12 |
| 3 |
| 4 |
| 2 |
| 21 |
=
| 7×3×2 |
| 12×4×21 |
=
| 1 |
| 24 |
(5)
| 2 |
| 13 |
| 5 |
| 8 |
| 15 |
| 26 |
=
| 2 |
| 13 |
| 5 |
| 8 |
| 26 |
| 15 |
=
| 2×5×26 |
| 13×8×15 |
=
| 1 |
| 6 |
(6)
| 7 |
| 10 |
| 5 |
| 16 |
| 21 |
| 32 |
=
| 7 |
| 10 |
| 5 |
| 16 |
| 32 |
| 21 |
=
| 7×5×32 |
| 10×16×21 |
=
| 1 |
| 3 |
点评:考查了分数四则混合运算,注意运算顺序和运算法则.
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