有d功課唔色.......(polynomials)

a.
=6a+d-2a+d
=4a+2d

b
=4x-5x+7-2x+6x
=3x+7

a
=2ca+4cb

b
=-4-20a-4a^2

c
=x^3+x^2+x+x^2+x+1
=x^3+2x^2+2x+1

a.6a+d)-(2a-d)

=6a+d-2a+d
=4a+2d

b.2 2
(4x -5x+7)- 2x -6x)

=4x-5x+7-2x+6x
=3x+7
multiply the following expressions by the method of expansion

a2c(a+2b)

=2ca+4cb

b)-4(1+5a+a SQUARE)
=-4-20a-4a^2

c)(x+1)(x SQUARE+x+1)
=x^3+x^2+x+x^2+x+1
=x^3+2x^2+2x+1

請自己找補習老師，不要在此問功課，難道你上課沒有聽書？？？
如此簡單的問題，在你的課本例題一定可以解答得到你的！
(a) 6a+d-2a+d
=4a+2d
=2(2a+d)

請參考一題,其他自己回答

a) (6a+d)-(2a-d)
=6a+d-2a+d
=4a+2d
=2(2a+d)

b) 2 2
(4x -5x+7)- 2x -6x)
唔明你寫什麼

a)2c(a+2b)
=2ca+4bc

b)-4(1+5a+a SQUARE)
= -4-20a-4aSQ

c)(x+1)(x SQUARE+x+1)
= x CUBE + x SQ + x SQ + x + x + 1
= x CUBE + 2x SQ + x + 1

唔知有無計錯, 十幾年無計過

2006-11-03 13:05:02 補充：
更正c)(x+1)(x SQUARE+x+1)= x CUBE + x SQ + x SQ + x + x + 1= x CUBE + 2x SQ + 2x + 1