题目内容

4100-204×15.2.5×2.4÷12-0.4.
2-
3
4
×2
1
3
÷2
4
5
[3
1
3
+(3.6-2
11
15
5
26
]÷3.5
(1)4100-204×15
=4100-3060,
=1040;
(2)2.5×2.4÷12-0.4
=6÷12-0.4,
=0.5-0.4,
=0.1;
(3)2-
3
4
×2
1
3
÷2
4
5

=2-
3
4
×
7
3
÷2
4
5

=2-
7
4
÷2
4
5

=2-
7
4
×
5
14

=2-
5
8

=
16
8
-
5
8

=1
3
8

(4)[3
1
3
+(3.6-2
11
15
5
26
]÷3.5

=[3
1
3
+(
54
15
-
41
15
)×
5
26
]÷3.5,
=[3
1
3
+
13
15
×
5
26
]÷3.5,
={3
1
3
+
1
6
}÷3.5,
={
20
6
+
1
6
}÷3.5,
=
7
2
÷3.5,
=3.5÷3.5,
=1.
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