Figgo_ye
幼苗
共回答了11个问题采纳率:100% 举报
(1)
7
8 +(
1
4 -
1
5 )÷
1
4 ,
=
7
8 +
1
20 ×4,
=
1
8 +
1
5 ,
=
13
40 ;
(2)
4
9 ×[
3
4 -(
7
16 -
1
4 )],
=
4
9 ×[
3
4 +
1
4 -
7
16 ],
=
4
9 ×[1-
7
16 ],
=
4
9 ×
9
16 ,
=
1
4 ;
(3)
3
4 ÷[3.75×(1.2-
1
5 )],
=
3
4 ÷[3.75×(1.2-0.2)],
=
3
4 ÷[
15
4 ×1],
=
3
4 ÷
15
4
=
3
4 ×
4
15 ,
=
1
5 ;
(4)15×14×(
1
5 +
1
7 ),
=15×14×
1
5 +15×14×
1
7 ,
=42+30,
=72;
(5)(
1
3 -
1
13 )×6-7÷13,
=
1
3 ×6-
1
13 ×6-
7
13 ,
=2-(
6
13 +
7
13 ),
=2-1,
=1.
1年前
8