F.1 數學...2條

( t - 3) ( t + 7)
=t² + 7t - 3t - 10
=t² + 4t - 10

希望冇錯! 有錯請指出

2007-11-14 21:40:50 補充：
中間第2步開始錯左小小..應該係 =t² 7t - 3t - 21=t² 4t - 21眼花睇錯左小小野@@"

(t-30(t+7)
=t²-3t+7t-21
=t²+4t-21

=t² 7t - 3t - 21
=t² 4t - 21

(t - 3 ) ( t + 7 )
= t² 7t - 3t - 21
=t² 4t - 21

(t-3) (t+7)
= (t ^2) + ( 7 t) + ( -3 t) + (-21)
= t ^2 + 4 t - 21


[x ^ y = x 的 y次方]

展開:
=t(t+7)-3(t+7)
=t的2次+7t-3t-21
=t的2次+4t-21
如有不明白,可以add我[email protected]

t(t+7)-3(t+7)
t^2+7t-3t-21
t^2+4t-21

=t^2+7t-3t-21
=t^2+4t-21

t(t+7)-3(t+7)
= t^2+7t-3t-21
= t^2+4t-21

我第一俾我啦!

= t^2 + 7t - 3t - 21
= t^2 + 4t - 21