F2 math題!!

In each of the following,change the subject of the formula to the letter in the square brackets.

3) y=1/4(x-3) [x](x-3) = 1/4yx = 1/4y + 3or
4y = x-3x = 4y+3
4) x=3/a-b [b]b = 3/a - xor
(a-b) = 3/xb = a - 3/x
5) v=u+at [a]at = v-ua = (v-u)/t
6) p=x/a-y/6 [x]
x/a = p + y/6x = ap + ya/6

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In each of the following,making the letter in the square brackets to be the subject of the formula.

7) 6-5m=4n [m]5m = 6-4nm = (6-4n)/5
8) 4x-3y/5=2 [y]3y/5 = 4x-2y = 5(4x-2)/3
9) 4x+5=2(x+y) [y]4x+5 = 2x+2y2y = 2x+5y = x + 5/2
10) 1/a=1/b-1/c [c]1/c = 1/b - 1/a = (a-b)/abc = ab/(a-b)
11) d=(3a+b)^2-(3a-b)^2 [b]d = (3a+b+3a-b)(3a+b-3a+b)d = 6a(2b)2b = d/6ab = d/12a


2011-09-01 19:14:30 補充：
I cannot see the question"""

because there is no question,only appreciated~

'nine questions in 7 minutes ~~'??

nine questions in 7 minutes ~~