✔ 最佳答案
1) Solve the following equations.
2(y - 4) = 14
y - 4 = 7
y = 11
2)
(r - 2)/3 + (r + 1)/2 = (3r - 1)/5 - 1
10(r - 2) + 15(r + 1) = 6(3r - 1) - 30 (兩邊乘30)
10r - 20 + 15r + 15 = 18r - 6 - 30
7r = -31
r = -31/7
3) Solve the following literal equations for z.
3h - 2z = 9h - 8
-2z = 6h - 8
z = -3h + 4
2007-01-08 09:54:49 補充:
10r - 20 + 15r + 15 = 18r - 6 - 30 25r - 5 = 18r - 36 25r - 5 - 18r = 18r - 36 - 18r (兩邊一齊減18r) 7r - 5 = - 36 7r - 5 + 5 = - 36 + 5 (兩邊一齊加5) 7r = -31 r = -31/7
2007-01-08 09:55:01 補充:
3h - 2z = 9h - 83h - 2z - 3h = 9h - 8 - 3h (兩邊一齊減3h) -2z = 6h - 8 -2z/(-2) = (6h - 8)/(-2) (兩邊一齊除-2) z = -3h + 4 個3h係因為個6h/(-2)而出黎的
2007-01-09 15:56:15 補充:
我本身有答案的~只是我羅來做小測而已~ 我而家PO出來比大家睇下自己計得岩唔岩~ 第一題:11 3 31 第二題:-4- 同 - -- 7 7 第三題:4-3h 補充時間:2007-01-08 15:08:29個answer同我一樣梗係岩啦