脱式计算，能简算的就要简算。

8.75x0.24+2.76 1.25x1.6x1.5 =8.75×4×0.06+2.76 =1.25×0.8×2×1.5=35×0.06+2.76 =1×3=2.1+2.76 =3=4.86 (22.4-12.8)÷0.64÷0.5 =(22.4-12.4-0.4)÷(0.64×0.5)=9.6÷0.32=3017.51-（1.7x0.3+2.48)=17.51-(0.51+2.48)=17.51-2.99=17.51-(3-0.01)=17.51-3+0.01=14.52

8.75x0.24+2.76 1.25x1.6x1.5 =(8+3/4)x 24/100+2+3/4+1/100 =1.25*8*0.2*1.5=8*24/100+1/100+200/100+3/4(24/100+1) =0.3=393/100+3/4*124/100=3.93+0.93=4.86

1.25x 0.8x(2x1.5)=3