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幼苗
共回答了12个问题采纳率:91.7% 举报
①
7
8 ÷5+
7
8 ÷2,
=
7
8 ×
1
5 +
7
8 ×
1
2 ,
=
7
8 ×(
1
5 +
1
2 ),
=
7
8 ×
7
10 ,
=
49
80 ;
②1.05×(3.8-0.8)÷6.3,
=1.05×3÷6.3,
=3.15÷6.3,
=0.5;
③
9
20 ÷[
1
2 ×(
2
5 +
4
5 )],
=
9
20 ÷[
1
2 ×
6
5 ],
=
9
20 ÷
3
5 ,
=
9
20 ×
5
3 ,
=
3
4 .
1年前
4