题目内容

计算下面各题(写出必要的过程)
①2
1
2
+3
1
3
+4
1
4
+5
1
5
+6
1
6

②3.8÷
5
3
+60%×7.2-0.6
1
6×8
+
1
10×12
+
1
12×14
+
1
14×16

④[(
9
10
-
17
72
+2.6÷26)÷(
25
27
-
1
9
)]÷9.375.

①2
1
2
+3
1
3
+4
1
4
+5
1
5
+6
1
6

=(2+
1
2
)+(3+
1
3
)+(4+
1
4
)+(5+
1
5
)+(6+
1
6
),
=(2+3+4+5+6)+(
1
2
+
1
3
+
1
4
+
1
5
+
1
6
),
=20+1
9
20

=21
9
20


②3.8÷
5
3
+60%×7.2-0.6,
=3.8×
3
5
+0.6×7.2-0.6,
=3.8×0.6+0.6×7.2-0.6,
=(3.8+7.2-1)×0.6,
=10×0.6,
=6;

1
6×8
+
1
10×12
+
1
12×14
+
1
14×16

=
1
2
×(
1
6
-
1
8
+
1
10
-
1
12
+
1
12
-
1
14
+
1
14
-
1
16

=
1
2
×(
1
6
-
1
8
+
1
10
-
1
16

=
1
2
×[(
1
6
+
1
10
)-(
1
8
+
1
16
)],
=
1
2
×(
4
15
-
3
16
),
=
1
2
×
19
240

=
19
480


④[(
9
10
-
17
72
+2.6÷26)÷(
25
27
-
1
9
)]÷9.375,
=[(
9
10
-
17
72
+0.1)÷(
25
27
-
1
9
)]÷9.375,
=[(1-
17
72
)÷(
25
27
-
1
9
)]÷9.375,
=[
55
72
÷
22
27
]÷9.375,
=
15
16
÷9.375,
=0.1.
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