2-[1-(1/2×2/3-1)]×(-0.75)²＋(-0.5)³×5²
=2-(1+2/3)×9/16-1/8×25
=2-15/16-8/25
=547/400
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2-[1-(1/2×2/3-1)]×(-0.75)²＋(-0.5)³×5²
=2-5/3*9/16-1/8*25
=2-15/16-25/8
=2-15/16-50/16
=2-65/16
=-33/16
=-2又1/16
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