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幼苗
共回答了15个问题采纳率:93.3% 举报
(1)
23
19 ×
1
12 -
17
19 ÷12
=
23
19 ×
1
12 -
17
19 ×
1
12 ,
=(
23
19 -
17
19 )×
1
12 ,
=
6
19 ×
1
12 ,
=
1
38 ;
(2)87÷
8
7 -
7
8 +14×0.875
=87×
7
8 -1×
7
8 +14×0.875,
=87×0.875-1×0.875+14×0.875,
=(87-1+14)×0.875,
=100×0.875,
=87.5;
(3)3
2
5 -
5
6 ÷
10
11 -
13
12
= 3
2
5 -
5
6 ×
11
10 -
13
12 ,
=3
2
5 -
11
12 -
13
12 ,
=3
2
5 -(
11
12 +
13
12 ),
=3
2
5 -2,
=1
2
5 ;
(4)
13
33 ÷(
20
33 +
10
11 -
1
3 )
=
13
33 ÷ (
20
33 +
30
33 -
11
33 ),
=
13
33 ÷
39
33 ,
=
13
33 ×
33
39 ,
=
1
3 ;
(5)
5
7 ×(
7
5 +
14
15 )
=
5
7 ×
7
5 +
5
7 ×
14
15 ,
=1+
2
3 ,
=1
2
3 ;
(6)[
3
4 ÷
3
4 +(
3
5 ÷9-
1
15 )]×
3
5
=[1+(
3
5 ×
1
9 -
1
15 )]×
3
5 ,
=[1+(
1
15 -
1
15 )]×
3
5 ,
=[1+0]×
3
5 ,
=
3
5 .
1年前
1