Form.2公式主項變換之一問(1)~20點

Part A:把以下各公式嘅主項變換成為括號入面嘅字母
1.y=2x+1 [x]

A. y=2x+1
2x = y-1
x = (y-1)/2

2. y=5x-3 [x]

A. y=5x-3
5x = y+3
x = (y+3)/5

3. v=u+at [u]

A. v=u+at
u = v-at

4. F=ma [a]

A. F=ma
a = F/m

5. V=1/3Ah [h]

A. V=1/3Ah
Ah = 3V
h = (3V)/A

6.V=L*b*h [b]

A. V = L*b*h
b = V/ (Lh)

7. C=PV/T [T]

A. C=PV/T
TC = PV
T = (PV)/C

8. C=5/9 (F-32) [F]

A. C=5/9 (F-32)
(9C)/5 = F-32
F = (9C-5) +32

9. E=1/2m v^2 [m]

A. Not clear.

10. mx-y+c=0 [x]

A. mx-y+c=0
mx = y-c
x = (y-c)/m

11. L= (a+3) M+b [M]

A. L= (a+3) M+b
(a+3)M = L-b
M = (L-b)/ (a+3)

12. P=2(L+w) [w]

A. P=2(L+w)
L+w = P/2
w = P/2-L

13. A=K (1-v) [v]

A. A=K (1-v)
1-v = A/K
1 = A/K+v
v = 1-(A/K)

14. T=mg-mf [m]

A. T=mg-mf
m (g-f) = T
m = T/ (g-f)

15. py-qx=rx [x]

A. py-qx=rx
rx+qx = py
x(r+q) = py
x = py/(r+q)

16. a/c +n=bn [n]

A. a/c +n=bn
n (b-1) = a/c
n = a/[c (b-1)]

17. x/a + y/b=1 [y]

A. x/a + y/b=1
y/b = 1-(x/a)
y = b [1-(x/a)]

18. q=p/a + p/b [p]

A. q=p/a + p/b
bp+ap = abq
p (a+b) = abq
p = abq/ (a+b)

19. s=ut+ 1/2a t^2 [a]

A. Not clear.

20. x=L (1+at) [a]

A. x =L (1+at)
1+at = x/L
at = x/L-1
a = t(x/L-1)

21. t= n/2 (T-10) H [T]

A. Not clear.

22. L=a+ (n-1) d [n]

A. L=a+ (n-1) d
(n-1)d = L-a
n-1 = (L-a)/d
n = (L-a)/d+1

23.A=2πr(rh) [h] π=3.14嘅符號(計算圓形周界嘅符號)

A. A = 2(pi)r(rh)
rh = A/[2(pi)r]
h = A/{r[2(pi)r]}

24. A=P+ Pnr/100 [P]

A. A=P+ Pnr/100
100P+Pnr = 100A
P(100+nr) = 100A
P = 100A/(100+nr)

25. (a-b) x-(a+b) y=0 [a]

A. (a-b) x-(a+b) y=0
ax-bx-ay-by = 0
a(x-y)-b(x+y) = 0
a(x-y) = b(x+y)
a = [b(x+y)]/(x-y)

26.1/y = /x+c [b]

A. Something is missing.

Q27 is missing?

28. S=a-aR^n/1-R [a]

A. Not clear.

29. a. F=(g- 1)/g [g] or b. F=g- (1/g)

A. a. F=(g- 1)/g
Fg = g-1
g(F-1) = -1
g = -1/(F-1)

or

b. I can’t find the answer.

30.x=1-y/1+y [y]

A. x=(1-y)/(1+y)
x+xy = 1-y
y(x+1) = 1-x
y = (1-x)/(x+1)

31. y=a+bx/c+dx [x]

A. Not clear.

32. y=c+ a-x/x [x]

A. Not clear.

2009-12-30 14:50:40 補充：
26. 1/y = 1/x+c [x]

A. 1/y = 1/x+c
x = y+cxy
x(1-cy) = y
x = y/(1-cy)

27. 1/a - 1/b = 1/c [b]

A. 1/a - 1/b = 1/c
bc-ac = ab
b(c-a) = ac
b = ac/(c-a)

1.y=2x+1 [x] 2.y=5x-3 [x] 3.v=u+at [u] 4.F=ma [a] 5.V=1/3Ah [h]
y-1=2X y+3=5x v-at=u F/m=a 1/3V=ah
y-1/2=X y+3/5=x 1/3V*1/a=h
6.V=L*b*h [b] 7.C=PV/T [T] 8.唔識做9.唔識做.10.mx-y+c=0 [x]
V*1/L*1/h=b CT=PV mx=0-c+y
T=PV/C x=0-c+y/m

之後我聽日再答......

1. y=2x+1 2.y=5x-3 3.v=u+at 4.F=ma 5.V=1/3Ah 6.V=Lbh
X=y-1/2 x=y+3/5 u=v-at a=m/F h=1/3AV b=v/Lh