题目内容
计算.
(1)(
×
-
×
)÷
(2)(4
-1.6×
)÷1
÷
×2
(3)
×[
-(
-0.25)]×(
+
+
+…+
).
(1)(
| 7 |
| 18 |
| 5 |
| 18 |
| 1 |
| 18 |
| 5 |
| 18 |
| 1 |
| 3 |
(2)(4
| 4 |
| 5 |
| 1 |
| 4 |
| 3 |
| 5 |
| 1 |
| 2 |
(3)
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 2010×2011 |
(1)(
×
-
×
)÷
,
=(
-
)×
×3,
=
×3×
=
;
(2)(4
-1.6×
)÷1
÷
×2
=(4.8-0.4)×
×2×2,
=4.4×
×4,
=11;
(3)
×[
-(
-0.25)]×(
+
+
+…+
),
=
×[
-(
-
)]×(1-
+
-
+
-
+…+
-
),
=
×[
+
-
]×(1-
),
=
×[1-
]×
,
=
×
×
,
=
.
| 7 |
| 18 |
| 5 |
| 18 |
| 1 |
| 18 |
| 5 |
| 18 |
| 1 |
| 3 |
=(
| 7 |
| 18 |
| 1 |
| 18 |
| 5 |
| 18 |
=
| 1 |
| 3 |
| 5 |
| 18 |
=
| 5 |
| 18 |
(2)(4
| 4 |
| 5 |
| 1 |
| 4 |
| 3 |
| 5 |
| 1 |
| 2 |
=(4.8-0.4)×
| 5 |
| 8 |
=4.4×
| 5 |
| 8 |
=11;
(3)
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 2010×2011 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2010 |
| 1 |
| 2011 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
| 7 |
| 16 |
| 1 |
| 2011 |
=
| 8 |
| 9 |
| 7 |
| 16 |
| 2010 |
| 2011 |
=
| 8 |
| 9 |
| 9 |
| 16 |
| 2010 |
| 2011 |
=
| 1005 |
| 2011 |
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