题目内容
计算
+
+
+…+
(x+0.5):2
=(x-4):
.
| 1 |
| 2 |
| 3 |
| 4 |
| 7 |
| 8 |
| 1023 |
| 1024 |
| 1 |
| 2 |
| 1 |
| 4 |
(1)
+
+
+…+
,
=1-
+1-
+1-
+…+1-
,
=1+1+1+…+1-(
+
+
+…+
),
=10-(1-
+
-
+
-
+…+
-
),
=10-(1-
),
=10-1+
,
=9
;
(2)(x+0.5):2
=(x-4):
,
2
×(x-4)=
×(x+0.5),
2
x-10=
×(x+
),
2
x-10=
x+
,
(2
-
)x=10
,
x=
,
x=
×
,
x=
.
| 1 |
| 2 |
| 3 |
| 4 |
| 7 |
| 8 |
| 1023 |
| 1024 |
=1-
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 1024 |
=1+1+1+…+1-(
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 1024 |
=10-(1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 512 |
| 1 |
| 1024 |
=10-(1-
| 1 |
| 1024 |
=10-1+
| 1 |
| 1024 |
=9
| 1 |
| 1024 |
(2)(x+0.5):2
| 1 |
| 2 |
| 1 |
| 4 |
2
| 1 |
| 2 |
| 1 |
| 4 |
2
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 2 |
2
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
(2
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 9 |
| 4 |
| 81 |
| 8 |
x=
| 81 |
| 8 |
| 4 |
| 9 |
x=
| 9 |
| 2 |
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