题目内容

脱式计算.
①2700×(506-499)÷900;
②33.02-(148.4-90.85)÷2.5;
③(1÷
2
7
+
2
7
÷1)÷5.1;
④(1.6×
5
8
+3.6÷
3
4
)×
4
29
①2700×(506-499)÷900
=2700÷900×7,
=3×7,
=21;

②33.02-(148.4-90.85)÷2.5
=33.02-57.55÷2.5,
=33.02-23.02,
=10;

③(1÷
2
7
+
2
7
÷1)÷5.1
=(
7
2
+
2
7
)×
10
51

=
53
14
×
10
51

=
265
357

④(1.6×
5
8
+3.6÷
3
4
)×
4
29

=(
8
5
×
5
8
+
18
5
×
4
3
)×
4
29

=(1+
24
5
)×
4
29

=
29
5
×
4
29

=
4
5
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