题目内容

脱式计算:
5025-2940÷28×7;
3.68×[1÷(2.1-2.09)];
5-5×
2
5
+
3
5

5
11
×[(
2
5
+
1
3
)÷
5
6
].
5025-2940÷28×7,
=5025-105×7,
=5025-735,
=4290;

3.68×[1÷(2.1-2.09)],
=3.68×[1÷0.01],
=3.68×100,
=368;

5-5×
2
5
+
3
5

=5-2+
3
5

=3
3
5



5
11
×[(
2
5
+
1
3
)÷
5
6
],
=
5
11
×[(
6
15
+
5
15
)×
6
5
],
=
5
11
×[
11
15
×
6
5
],
=
5
11
×
22
25

=
2
5
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