help!!!!!!!math 20點

2008-08-11 8:15 pm

1. 216a^5 b^3 / 36a^3b^2

2.12a^2b-6ab^2/8a-4b

3.14a^2b3/15ac^2 * 20abc^4/6a^2 除以7b^2c^3/9a

4.(3y-2)^2-9y^2-4除以15y-10/6y+4

5.3/5a - 2/3a

6.7/4x-8 - 5/8-4x

7.4/3(3a-2) + 3/2(2-3a)

8.6/2a-5 + 11/4(2a-5) -3

9.12a^2 b-20ab^2 / 2a^2 b^3*15ab^2+25b^3/18a^2-50b^2

10.20a^2 -5b^2/16a^2 c+8abc* 3abc^2/12a^3-12ab+3b^2 除以4ab/18a-9b

Make the letter in the square bracket the subject of the formula

1.P=5(a+b) <b>

2.8=3x-2a / 3x+2a <x>

3.2a=3/4b - 5/c <b>

4.u=開方4v^2 + 9as

要有步驟呀!!!!!!

回答 (1)

STEVIE-G™

2008-08-13 8:43 pm

✔ 最佳答案

The formulas of index calculation are as follows:
(Try it yourself first)
if a is not 0

1.(a^m)*(a^n)=a^(m+n)

2.(a^m)/(a^n)=a^(m-n)

3.(a^m)^n=a^mn

4.a^0=1

5.a^-n=1/(a^n)

6.(ab)^n=(a^n)(b^n)

7.(a/b)^n=(a^n)/(b^n)
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