题目内容

口算.
3
14
×7
=
3
7
×
3
7
=
3
10
×6
=
9
16
×
8
3
=
1
8
×3×
8
9
=
1
4
+
3
4
×
1
3
=
1
2
3
×
3
5
=
7
15
×10
=
分析:①-⑤,⑧题,约分计算;     ⑥题,先算乘法,再算加法;      ⑦把带分数化为假分数,约分计算.
解答:解:①
3
14
×7=
3
2
;          ②
3
7
×
3
7
=
9
49
;            ③
3
10
×6
=
9
5
;           ④
9
16
×
8
3
=
3
2

1
8
×3×
8
9
=
1
3
,⑥
1
4
+
3
4
×
1
3
=
1
2
;         ⑦1
2
3
×
3
5
=1;           ⑧
7
15
×10
=
14
3
点评:完成此题,主要通过约分简算.
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