（+71/4）-（+6.25）-（-17/2）-（+0.75）-89/4
=71/4-25/4+17/4-1/4-89/4
=（71-25+17-1-89）/4
=-27/4-27÷9/4×（-9/4)+4-4×（-3/1)要過(guò)程-27÷9/4×（-9/4)+4-4×（-3/1)=-27×4/9×（-9/4)+4-4×（-3/1) =27+4-3/4=31-3/4=29又3/2（-2/3)×1/2+(-1/3)+(-0.5)要過(guò)程（-2/3)×1/2+(-1/3)+(-0.5) =-1/3-1/3-1/2=-2/3-1/2=-7/6（2/3-1/4-3/8)×（-24）要過(guò)程（2/3-1/4-3/8)×（-24）=-2/3×24+1/4×24+3/8×24=-16+6+9=-1事不過(guò)三，再追問(wèn)就要扣分了，有問(wèn)題再發(fā)到網(wǎng)上啊