28-(3.4+1.25×2.4)=28-(3.4+1又1/4×2.4)=28-(3.4+5/4×2.4)=28-(3.4+5×0.6)=28-(3.4+3)=28-6.4=21.6
28-(3.4+1.25×2.4)=28-(3.4+1.25×8×0.3)=28-(3.4+10×0.3)=28-6.4=21.6
原式=28-3.4-1.25*8*0.3=24.6-3=21.6
24一(4.4十1.25x2.4)=多少呀?