题目内容

递等式计算(能简算的要简算)
18.08-(1.08+
7
9
)-
2
9
79
4
9
×0.875+
7
9
÷1.6
12.4-2.4÷
4
15
÷2.5    
4.2÷[
2
5
×(2.8-1.05)]
(3.6×0.75×1.2)÷(1.5×24×0.18)
3
10
+
3
40
+
3
88
+
3
154
(1)18.08-(1.08+
7
9
)-
2
9

=18.08-1.08-
7
9
-
2
9

=17-(
7
9
+
2
9
),
=17-1,
=16;

(2)79
4
9
×0.875+
7
9
÷1.6
=(80-
5
9
)×
7
8
+
7
9
÷
8
5

=80×
7
8
-
5
9
×
7
8
+
7
9
×
5
8

=70-(
7
9
×
5
8
-
7
9
×
5
8
),
=70-0,
=70;

(3)12.4-2.4÷
4
15
÷2.5   
=12.4-2.4×
15
4
÷2.5,
=12.4-0.6×15÷2.5,
=12.4-3.6,
=8.8;

(4)4.2÷[
2
5
×(2.8-1.05)]
=4.2÷[
2
5
×1.75],
=4.2÷0.7,
=6;

(5)(3.6×0.75×1.2)÷(1.5×24×0.18)
=3.6×0.75×1.2÷1.5÷24÷0.18,
=(3.6÷0.18)×(0.75÷1.5)×(1.2÷24),
=20×0.5×0.05,
=0.5;

(6)
3
10
+
3
40
+
3
88
+
3
154

=
3
2×5
+
3
5×8
+
3
8×11
+
3
11×14

=
1
2
-
1
5
+
1
5
-
1
8
+
1
8
-
1
11
+
1
11
-
1
14

=
1
2
-
1
14

=
7
14
-
1
14

=
3
7
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