3條f.2升f.3數學(公式主項轉換)

1.
情況一：
(1 + r)/R = A
1 +r = RA
r = RA - 1

情況二：
1 + (r/R) = A
r/R = A - 1
r = R(A - 1)


=====
2.
F = GmM/d
Fd = GmM
d = GmM/F


=====
3.
4S = a/(1 - 2R)
4S(1 - 2R) = a
1 - 2R = a/4S
2R = 1 - (a/4S)
2R = (4S - a)/4S
R = (4S - a)/8S

2011-07-23 17:32:53 補充：
21x² = 3 * 7 * x²
14x = 2 * 7 * x

H.C.F. = 7 * x = 7x
L.C.M. = 2 * 3 * 7 * x² = 42x²