解;(1)x:0.5=
:42 3
4x=0.5×
2 3
4x=
1 3
4x÷4=
÷41 3
x=
;1 12
(2)x:2=0.15:0.6
0.6x=2×0.15
0.6x=0.3
0.6x÷0.6=0.3÷0.6
x=0.5
(3)0.4=1-2x
2x+0.4=1-2x+2x
2x+0.4-0.4=1-0.4
2x=0.6
2x÷2=0.6÷0.2
x=3