中三數學 超急 10點

As follow AS~~

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2008-11-01 11:04:34 補充：
打錯
唔係138係128。

(2x2y3)-5
---------------------
(-2x3)2
2-5x-10y-15
= ---------------------
(-2)2x6
=2-5-(2)x-10+(-6)y-15
=2-7x-16y-15
1
=-------------------------
27x16y15

2008-10-31 22:23:46 補充：
(2x^2y^3)^(-5)

---------------------

(-2x^3)^2

2008-10-31 22:24:20 補充：
2^(-5)x^(-10)y^(-15)

= ---------------------

(-2)^2x^6

2008-10-31 22:24:56 補充：
=2^[-5-(2)]x^[-10+(-6)]y^(-15)

2008-10-31 22:25:15 補充：
=2^(-7)x^(-16)y^(-15)

2008-10-31 22:25:38 補充：
1

=---------------------

2^7 x^16 y^15

2008-10-31 22:25:57 補充：
上標顯示有問題

[(2x²y^3)^-5]/(-2x^3)²

=[(2^-5)(x^-10)(y^-15)]/(-2)²(x^6)

=[(32^-1)((x^-10)(y^-15)]/4x^6

=1/(128x^16y^15)

(2 x^2 y^3)^-5 / (-2 x^3)^2

=2^-5 x^-10 y^-15 / (-2)^2 x^6

=1/ 2^2+5 x^6+10 y^15

=1 / 128 x^16 y^15

問題
= (2^-5X^-10Y^-15) /(2^2X^6)
= 1/(2^7X^16Y^15)

= (2^-5X^-10Y^-15) /(2^2X^6)
= 1/(2^7X^16Y^15)