x-0.85x=3
0.15x=3
x=207x5x等于120 怎么算？4x减1点2等于74 怎么算？3点8x减x等于0点56 怎么算？7x*5x=12035x^2=120x^2=4x=±24x-1.2=744x=75.2x=18.83.8x-x=0.562.8x=0.56x=0.2谢谢，7x家3x家26等于74这一道？7x+3x+26=7410x=48x=4.8