1-4x=0.2两边减去0.21-4x-0.2=00.8-4x=0两边减去0.8-4x=0-0.8=-0.8两边同时除以-4x=-0.2
1-4x=0.24x=0.8x=0.2
4x=0.8x=0.2
1-4x=0.24x=1+0.2=1.2x=0.3
解 1-4x=0.2 4x+0.2=1 4x=1-0.2 4x=0.8 x=0.8*4 x=0.2