有幾條數唔識做(變換主項)

1.
C=3(T-5) [T]
C/3=T-5
C/3 +5=T
2.
S=1/2(A-B)X [B]
2S=(A-B)X
2S/X=A-B
B=A-2S/X
3.
S=1/2(A-B)X [X]
2S/A-B=X
4.
V=ABC [A]
A=V/BC
5.
S=2(AB+AX) [A]
S/2=AB+AX
S/2=A(B+X) (因式分解)
A=S/2B+2X
6.
D=L/(L-M) [M]
D(L-M)=L
L-M=L/D
M=L-L/D

如有不明白可以SD-E貓比我問=]
步驟應該唔係飛得好多...

As Follow AS~~~

圖片參考：http://www.photo-host.org/img/726195screenhunter_02_sep._03_00.26.gif

1. c=3(t-5)
c=3t-15
t=(c+15)/3
2. a- (2S)/x =b
b=a- (2S)/x
3. x = 2S / (a+b)
4 a = V / (bc)
5. S/2 = a (b+x)
a = S / (2b+2x)
6. m = l - ( l / d)