Câu hỏi của LONG DZ

Question

ChillWithMe · Accepted Answer

$A
=
1
+
2
+
4
+
8
+
16
+
...
+
1024
+
2048$$⇒
2
A
=
2
+
4
+
8
+
16
+
32
+
...
+
2048
+
4096$$⇒
2
A
−
A
=
(
2
+
4
+
8
+
16
+
32
+
...
+
2048
+
4096
)
−
(
1
+
2
+
4
+
8
+
16
+
...
+
1024
+
2048
)$$⇒
A
=
4096
−
1$$⇒
A
=
4095$Câu trả lời: $A
=
1
+
2
+
4
+
8
+
16
+
...
+
1024
+
2048$$⇒
2
A
=
2
+
4
+
8
+
16
+
32
+
...
+
2048
+
4096$$⇒
2
A
−
A
=
(
2
+
4
+
8
+
16
+
32
+
...
+
2048
+
4096
)
−
(
1
+
2
+
4
+
8
+
16
+
...
+
1024
+
2048
)$$⇒
A
=
4096
−
1$$⇒
A
=
4095$

chuche · Answer

$A
=
1
+
2
+
4
+
8
+
16
+
...
.
.
+
1024
+
2048$$2
A
=
2
+
4
+
8
+
16
+
32
+
...
.
+
2048
+
4096$$2
A
−
A
=
(
2
+
4
+
8
+
16
+
32
+
...
.
+
2048
+
4096
)
−
(
1
+
2
+
4
+
8
+
16
+
...
.
.
+
1024
+
2048
)$$A
=
4096
−
1$$A
=
4095$Câu trả lời: $A
=
1
+
2
+
4
+
8
+
16
+
...
.
.
+
1024
+
2048$$2
A
=
2
+
4
+
8
+
16
+
32
+
...
.
+
2048
+
4096$$2
A
−
A
=
(
2
+
4
+
8
+
16
+
32
+
...
.
+
2048
+
4096
)
−
(
1
+
2
+
4
+
8
+
16
+
...
.
.
+
1024
+
2048
)$$A
=
4096
−
1$$A
=
4095$

Vũ Quang Huy · Answer

A=1+2+4+8+16+...+1024+2048⇒2A=2+4+8+16+32+...+2048+4096⇒2A−A=(2+4+8+16+32+...+2048+4096)−(1+2+4+8+16+...+1024+2048)⇒A=4096−1⇒A=4095Câu trả lời: A=1+2+4+8+16+...+1024+2048⇒2A=2+4+8+16+32+...+2048+4096⇒2A−A=(2+4+8+16+32+...+2048+4096)−(1+2+4+8+16+...+1024+2048)⇒A=4096−1⇒A=4095

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