脱式计算.①2700×(506-499)÷900;②33.02-(148.4-90.85)÷2.5;③(1÷27+27÷1)÷5.1;④(1.6×58+3.6÷34)×429.-数学

题文

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
题型:解答题  难度:中档

答案

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

据专家权威分析,试题“脱式计算.①2700×(506-499)÷900;②33.02-(148.4-90.85)÷2.5;..”主要考查你对  整数的四则混合运算及应用题  等考点的理解。关于这些考点的“档案”如下:

整数的四则混合运算及应用题