0.5*(8x+0.4)=1.44x+0.2=1.44x=1.4-0.24x=1.2x=1.2÷4x=0.3
0.5*(8x+0.4)=1.48x+0.4=1.4×28x+0.4=2.88x=2.8-0.48x=2.4x=2.4÷8x=0.3 不懂可追问，有帮助请采纳，谢谢！
