數學問題~幫幫手!

x + 1/2x = 3
2x + x = 6
3x = 6
x = 2

5/2y - y = 6
5y - 2y = 12
3y = 12
y = 4

5/4t + 3 = 3/4t
5t + 12 = 3t
2t = -12
t = -6

-2 + 1/3a = 7/3a
-6 + a = 7a
6a = -6
a = -1

x+1/2x=3
2乘(x+1/2x)=3乘2
x+x=6
2x=6
x=3


5/2Y-Y=6
2乘(5/2y-y)=6乘2
5y-2y=12
3y=12
y=4


5/4t+3=3/4t
4乘(5/4t+3)=(3/4t)乘4
5t+12=3t
5t-3t= -12
2t= -12
t= -6


-2+1/3A=7/3A
3乘(-2+1/3a)=7/3a乘3
-6+a=7a
-6=7a -a
-6=6a
-1=a
a= -1


(中學做法)

2006-10-18 21:24:04 補充：
1)x+1/2x=32乘(x+1/2x)=3乘22x+x=63x=6x=2sorry,打錯左