3.4+1.25*2.4=3.4+1.25*(2+0.4)=3.4+1.25*2+1.25*0.4=3.4+2.5+0.5=3.4+3=6.4
=3.4+1.25*8*0.3=3.4+10*0.3=3.4+3=6.4
3.4+1.25*2.4=3.4+1.25*8*0.3=3.4+10*0.3=3.4+3=6.4
=3.4+5/4*12/5=3.4+12/4=3.4+3=6.4
