<span>(0,1*5-1,5):0,4=(0,5-1,5):0,4= -1:0,4=-2,5</span>
<span><span>0,1*(5-1,5:0,4)= 0,1*(5-3,75)=0,1*1,25=0,125</span></span>
<span><span><span>0,1*(5-1,5):0,4=0,1*3,5:0,4=0,35:0,4=0,875</span></span></span>