方程(中一)暑期加油打氣坊

1.
4t-6 = 4-t
4t-6+6 = 4-t+6
4t = 10-t
4t+t = 10-t+t
5t =10
5t/5 = 10/5
t=2

2.
90%y -16 = 85%y
0.9y -16 = 0.85y
0.9y -16 -0.85y = 0.85y -0.85y
0.05y -16 = 0
0.05y -16 +16 = 0+16
0.05y = 16
0.05y /0.05 = 16 /0.05
y=400

2012-08-11 17:27:44 補充：
Sorry!
16 /0.05 = 320
y=320

1.t=0.4

2y=320

2012-08-11 17:09:08 補充：
sorry
t=0.4

2.y=320