請大家教我這幾方程(要步驟+答案)

1.
1/9(h+9)=5/6-1/2(h +7)
2(h + 9) = 15 - 9( h + 7)
2h + 18 = 15-9h - 63
11h = -66
h = -6

2.
a/3-a/2=1

2a - 3a = 6
-a = 6
a = -6

3.
3/4y=1-1/2y
3y = 4 - 2y
5y = 4
y = 4 / 5

2006-10-26 16:23:52 補充：
x-6=x-3/4 4x - 24 = x - 33x = 21x = 7x 1/2x=3 2x x=6x = 25/2y-y=6 3 / 2 y = 63y = 12y =45/4t 3=3/4t 5t 12 = 3t2t = -12t =-6

2006-10-26 16:27:04 補充：
2y 1/5=3-y 10y 1 = 15 - 5y15y = 14y =14 / 158x 3x-7/2=6 11x - 3.5=611x = 9.5x = 95 / 110 = 19 / 253/4y=1-1/2y 3y = 4 - 2y5y = 4y = 4 / 525/3-1=s 2/5 125 - 15 = 15s 6116 = 15ss = 116 / 15r 6/3=r/2 7/6 6r 12 = 3r 73r = -5r = -5 / 3