教學
題:
math??
eva
2006-10-15 20:23:36 UTC
x2y2-9z2=??
8a2-18b2=??
二 答案:
2006-10-16 00:02:04 UTC
x^2y^2 -9z^2
= (xy)^2 - (3z)^2
=(xy+3z).(xy-3z)
8a^2 - 18b^2
=2(4a^2-9b^2)
=2.[(2a)^2 - (3b)^2]
=2.(2a+3b).(2a-3b)
2006-10-22 02:58:12 補充:
下面那位請不要copy answer !!
siulong
2006-10-17 09:11:48 UTC
x^2y^2 -9z^2
= (xy)^2 - (3z)^2
=(xy+3z).(xy-3z)
8a^2 - 18b^2
=2(4a^2-9b^2)
=2.[(2a)^2 - (3b)^2]
=2.(2a+3b).(2a-3b)
^^
ⓘ
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