數學方程問題,要解釋,不求答案?

1.
m = abc / ( a - b )
ma - mb = abc
ma = mb + abc = b( m + ac )
b = ma / ( m + ac ) ..... Ans

2.
(x+a) / (x-a) = 2 / 3
2(x-a) = 3(x+a)
2x - 2a = 3x + 3a
x = - 5a ..... Ans

3.
( 這題應該是要求 k , 而不是求 x )
Sol :
x = - 5 為此方程式之解, 故可滿足此方程式:
k( - 5 ) - 7 = 17 + k
- 5 k - 7 = 17 + k
6k = - 24
k = - 4 ..... Ans

1.
m = abc / ( a - b )
ma - mb = abc
ma = mb + abc = b( m + ac )
b = ma / ( m + ac )

2.
(x+a) / (x-a) = 2 / 3
2(x-a) = 3(x+a)
2x - 2a = 3x + 3a
x = - 5a

3.
( 這題應該是要求 k , 而不是求 x )
x = - 5 為此方程式之解, 故可滿足此方程式:
k( - 5 ) - 7 = 17 + k
- 5 k - 7 = 17 + k
6k = - 24
k = - 4