我來(lái)脫式計(jì)算
12×
1
3
÷
2
3
         
1
7
+
5
7
÷
5
6
         
1
15
×9÷
3
5
5
8
×
4
7
÷
5
7
        
7
9
÷
2
3
÷
7
8
      
3
10
÷(1-
1
10
分析:橫向數(shù):
(1)(3)(4)(5)按照從左到右順序解答,
(2)按照先算除法,再算加法順序解答,
(6)按照先算括號(hào)里面的,再算括號(hào)外面的順序解答.
解答:解:12×
1
3
÷
2
3
   
=4÷
2
3

=6;

1
7
+
5
7
÷
5
6
         
=
1
7
+
6
7

=1;

1
15
×9÷
3
5

=
3
5
÷
3
5

=1;

5
8
×
4
7
÷
5
7
   
=
5
14
÷
5
7

=
1
2
;

7
9
÷
2
3
÷
7
8

=
7
6
÷
7
8

=1
1
3
;

3
10
÷(1-
1
10

=
3
10
÷
9
10

=
1
3
點(diǎn)評(píng):本題主要考查學(xué)生依據(jù)四則運(yùn)算計(jì)算方法正確進(jìn)行計(jì)算的能力,關(guān)鍵是計(jì)算結(jié)果要準(zhǔn)確.
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