數學方程!!

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

2)5/2y-y=6
5/2y=6+y
y=(6+y)*5/2
y=15+2.5y
3.5y/3.5=15/3.5
y=15/3.5

3)5/4t+3=3/4t
1.25t+3=0.75t
3=0.75t-1.25t
3=-0.5t
3/-0.5=t
-6=t

4)-2+1/3a=7/3a
-2=7/3a-1/3a
-2=3a
-2/3=a

第2&第4題錯!

tuee

1) x+1/2x=3
x+1 =3(2x)
x+1 =6x
1 =6x-x
1 =5x
x =0.2





2) 5/2y-y=6
5/y =6
5 =6y
y =5/6





3) 5/4t+3=3/4t
3 =3/4t - 5/4t
3 = -2/4t
3 = -1/2t
2t = -1/3
t = -2/3




4) -2+1/3a=7/3a
-2 =7/3a - 1/3a
-2 =7-1/3a
-2 =6/3a
-2 =2/a
a = 2/-2
a =-1


希望幫到你la !! =]