1,0.4x-1又5分之1=5.60.4x=5.6+1.20.4x=6.8x=6.8÷0.4x=172,x+3x=16.84x=16.8x=4.23,1.26乘5-4分之3x=1又2分之1 6.3-3/4x=1.53/4x=6.3-1.53/4x=4.8x=4.8÷3/4x=6.4 如果本题有什么不明白可以追问,...