(1)0.4x-8.5*2=27
0.4x-17=27
0.4x=10
x=25
(2)x-3/4x+6=12
1/4x+6=12
1/4x=6x=24
(3)46-(4x+12)=2.5*8
46-4x-12=20
46-4x=32
-4x=-14
x=7/2
(4)1/8(x+0.5)=3/4
1/8x+1/16=3/4
1/8x=1/2
x=4第四题呢.有啊