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2011-1-28 19:11 wilson29

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1)a^2+a^4-b^7+a^9

=[color=White]a^15-b^7[/color](Ô£)

2)(a^2+a^6)^7

=[color=white]a^56[/color]

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2011-1-28 19:14 0083
1)a^15-b^7
2)(a^8)^7
----------------------
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2011-1-28 19:33 Amuro
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2011-1-28 19:56 hei
[quote]�쩫�� [i]0083[/i] �� 2011-1-28 19:14 �o��
1)a^15-b^7
2)(a^8)^7
----------------------
5�@�w��,����5�n�ܧ� [/quote]
a^2+a^6=a^8?
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2011-1-28 20:16 wilson29

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2011-1-28 20:17 kimwong3252000
prove of (1):

a^2+a^4-b^7+a^9

=a^15-b^7

sub a=2,  b=3

2^2+2^4-3^7+2^9
=-1655

2^15-3^7
=30581

statement (1) is not correct

2011-1-28 20:23 kimwong3252000
prove of (2)

(a^2+a^6)^7

=a^56

sub a=2

(2^2+2^6)^7
=6.72x10^12

2^56
=7.21x10^16

statement 2is not correct

2011-1-28 20:58 0083

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2011-1-29 00:39 Amuro
[quote]�쩫�� [i]kimwong3252000[/i] �� 2011-1-28 20:23 �o��
prove of (2)

(a^2+a^6)^7

=a^56

sub a=2

(2^2+2^6)^7
=6.72x10^12

2^56
=7.21x10^16

statement 2is not correct [/quote]
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2011-1-29 02:21 UniCorn
[quote]�쩫�� [i]Amuro[/i] �� 2011-1-29 12:39 AM �o��

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���}�������...�S���Y��,power�I�i�H+�I = =
assume the theory of 0083 is correct
then x^y +x^z =x^(y+z)
put x=2,y=3,z=4,
LHS=2^3+2^4
     =8+16=24
RHS=2^(3+4)
     =2^7=128
��LHS��RHS
��the theory is wrong

1)a^2+a^4-b^7+a^9
=a^2(1+a^2+a^7)-b^7
=a^2[1+a^2(1+a^5)]-b^7

2)(a^2+a^6)^7
=a^14(1+a^28)

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