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( 5 8 + 2 27 )×8+ 11 27

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/21 23:35:13
(1)(
5
8 +
2
27 )×8 +
11
27 ,
=
5
8 ×8+
2
27 × 8+
11
27 ,
=5+1,
=6;
(2)
1
2 ÷[
2
3 ×(
1
6 +
1
3 )],
=
1
2 ÷[
2
3 ×
1
6 +
2
3 ×
1
3 ],
=
1
2 ÷
1
3 ,
=
1
2 × 3,
= 1
1
2 ;
(3)
2.5×3+0.8
16×1.5+0.9 ×
9
11 -
7
33 ,
=
25×3+8
16×15+9 ×
9
11 -
7
33 ,
=
1
3 ×
9
11 -
7
33 ,
=
3
11 -
7
33 ,
=
2
33 ;
(4)999
8
9 +99
8
9 +9
8
9 +
1
3 ,
=999+99+9+
8
9 × 3+
1
3 ,
=999+99+9+3,
=(999+1)+(99+1)+(9+1),
=1000+100+10,
=1110.