計算,我能行.
9
10
÷
3
8
÷
1
5
=
4
7
÷
1
2
×7=
3
4
×
8
15
×
5
8
=
5
8
÷
7
12
÷
10
7
=
5
12
÷
5
9
=
18÷
9
10
×
3
5
=
分析:(1)(2)(4)(5)(6)把除法變?yōu)槌朔�,約分計算;
(3)約分計算.
解答:解:(1)
9
10
÷
3
8
÷
1
5

=
9
10
×
8
3
×5
=12;

(2)
4
7
÷
1
2
×7
=
4
7
×2×7
=8;

(3)
3
4
×
8
15
×
5
8
=
1
4


(4)
5
8
÷
7
12
÷
10
7

=
5
8
×
12
7
×
7
10

=
3
4
;

(5)8×
5
12
÷
5
9

=8×
5
12
×
9
5

=6;

(6)18÷
9
10
×
3
5

=18×
10
9
×
3
5

=12.
點評:本題考查了學生通過約分對分數(shù)四則混合運題目進行簡算的能力.
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