F.2數學((主項轉換*急*急*急**20點

1.
T=a+(n-1)d
T=a+nd-d
nd=T-a+d
n=(T-a)/d+1

2.
A(x+y)=B-Cx-Cy
Ax+Ay=B-Cx-CY
Ax+Cx=B-AY-CY
x(A+C)=B-Y(A+C)
x=B/(A+C)-Y

3.
y=(x-b)/x+c
y-c=(x-b)/x
(y-c)x=x-b
x-(y-c)x=b
x(1-y+c)=b
x=b/(1-y+c)

4.
S=(u+v)t/(2s)-w
S+w=(u+v)t/(2s)
2s(S+w)=(u+v)t
u=2s(S+w)/t-v

1. T=a+(n-1)d [主項:n]
T-a+d=dn
n=(T-a+d)/d

2. A(x+y)=B-Cx-Cy [主項:x]
Ax+Cx=B-Cy-Ay
x(A+C)=B-Cy-Ay
x= (B-Cy-Ay) / (A+C)

3. y=x-b+c [主項:x]
x
yx=x-b+c
x(y-1)= c+b
x= (c+b) / (y-1)

4. S=1 (u+v) t-w [主項:u]
2 ( s )
2 (S+w)= (u+v) t
u=(2S+2w) / t-v