2-[1-(1/2×2/3-1)]×(-0.75)²+(-0.5)³×5²
=2-[1-(1/3-1)]×(9/16)+(-1/8)×25
=2-[1-(-2/3)]×(9/16)-(25/8)
=2-(5/3)×(9/16)-(25/8)
=2-(15/16)-(25/8)
=(17/16)-(25/8)
=-33/16
2-[1-(1/2*2/3-1)]*(-0.75)2次方+(-0.5)3次方*5的2次方
=2-[1-(1/3-1)]*9/16+(-1/8)*25
=2-[1+2/3]*9/16-25/8
=2-5/3*9/16-25/8
=2-15/16-50/16
=2-65/16
=-33/16
=-2又1/16
以上答案正确