解：设这个数是x1/5 x-18.5*2%=0.150.2x=0.15+18.5*0.020.2x = 0.52x=2.6算式：(18.5×2%+0.15)÷1/5=2.6
18.5的2%是0.37,0.37+0.15=0.52,0.52*5=2.6.这个数是2.6
这个数是(18.5×2%+0.15)×5=2.6
2.6
