有數學唔識做??

2007-06-01 9:45 am
1.(5w2次方y4次方)(-7w4次方y3次方)
要有過程 ,要有三個=

回答 (2)

2007-06-01 10:03 am
✔ 最佳答案
其實很簡單的,過程如下:

(5w^2y^4)(-7w^4y^3) { ^ 等於次方:w^2=w的2次方)

=5(-7)(w^2)(w^4)(y^4)(y^3) {將每個相似項分在一起}

=-35[w^(2+4)][y^(4+3)] {再將d指數加在一起}

=-35w^6y^7 {就會得到答案}

hope it will be helpful!
2007-06-01 9:53 am
= (5x-7) (w2次方 x w4次方) (y4次方 x y3次方)
= -35 w(2+4)次方 y(4+3)次方
= -35 w6次方 y7次方
參考: myself


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