10分 F.1 Maths 急

2007-10-20 4:29 pm
化簡:
(1) 2(m+1次方)
--------------------
2(m次方)
(2) 3(s+2次方)
--------------------
3(s+1 次方)
(3) p(13次方)x 4p(8次方)
--------------------------------
2p(6次方)
(4) 9p(7次方)x 4p(5次方)/18p(10次方)
(5) 10q(3次方)/ 2q(2次方)x ( -6q(8次方))
(6) (5 X(2次方) y(3次方)) x (2Xy)
(7) 48 X(2次方) y(4次方)/ ( -12Xy(3次方))
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回答 (2)

2007-10-20 5:11 pm
✔ 最佳答案
1)
2^(m+1) / 2^m <- ^ 代表次方, ^2 即是等於二次方)
= 2^(m+1-m)
= 2^1
= 2

2)
3^(s+2) / 3^(s+1)
= 3^(s+2-s-1)
= 3^1
= 3

3)
p^13 * 4p^8 / 2p^6
= 4/2 * p^(13+8-6)
= 2p^15

4)
9p^7 * 4p^5 / 18p^10
= 9*4/18 * p^(7+5-10)
= 2p^2

5)
10q^3 / 2q^2 * (-6q^8)
= 10*(-6)/2 * q^(3-2+8)
= -30q^9

6)
5x^2y^3 * 2xy
= 5*2 * x^(2+1) y^(3+1)
= 10x^3y^4

7)
48x^2y^4 / -12xy^3
= 48/(-12) * x^(2-1) y^(4-3)
= -4xy
2007-10-20 5:49 pm
化簡:
(1) 2(m+1次方)
-------------------- = 2 (因 2^m上下相約去)
2(m次方)
(2) 3(s+2次方)
-------------------- = 3 (同理: s+2 - (s + 1))
3(s+1 次方)
(3) p(13次方)x 4p(8次方)
-------------------------------- = 4p(13+8次) / 2p^6 = 2p^15
2p(6次方)
(4) 9p(7次方)x 4p(5次方)/18p(10次方)= 9*4/18 p^(7+5-10)=2p^2
(5) 10q(3次方)/ 2q(2次方)x ( -6q(8次方))
= 10*(-6)/2 q^(3-2+8)=-30q^9
(6) (5 X(2次方) y(3次方)) x (2Xy)=5*2 x^(2+1) y^(3+1)=10x^3y^4
(7) 48 X(2次方) y(4次方)/ ( -12Xy(3次方))=48/-12 x^(2-1)y^(4-3)=-4xy
請盡量提供準確答案!! 萬分感激!!
參考: 自己


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