题目内容

计算.
(1)(
7
18
×
5
18
-
1
18
×
5
18
1
3

(2)(4
4
5
-1.6×
1
4
)÷1
3
5
÷
1
2
×2

(3)
8
9
×[
3
4
-(
7
16
-0.25
)]×(
1
1×2
+
1
2×3
+
1
3×4
+…+
1
2010×2011
).
(1)(
7
18
×
5
18
-
1
18
×
5
18
)÷
1
3

=(
7
18
-
1
18
)×
5
18
×3,
=
1
3
×3×
5
18

=
5
18


(2)(4
4
5
-1.6×
1
4
)÷1
3
5
÷
1
2
×2
=(4.8-0.4)×
5
8
×2×2,
=4.4×
5
8
×4,
=11;

(3)
8
9
×[
3
4
-(
7
16
-0.25)]×(
1
1×2
+
1
2×3
+
1
3×4
+…+
1
2010×2011
),
=
8
9
×[
3
4
-(
7
16
-
1
4
)]×(1-
1
2
+
1
2
-
1
3
+
1
3
-
1
4
+…+
1
2010
-
1
2011
),
=
8
9
×[
3
4
+
1
4
-
7
16
]×(1-
1
2011
),
=
8
9
×[1-
7
16
2010
2011

=
8
9
×
9
16
×
2010
2011

=
1005
2011
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