(-999 又2/3)平方
=(999 又2/3)平方
=(1000-1/3)²
=1000²-2×1000×1/3+(1/3)²
=1000000-2000/3+1/9
=1000000-6000/9+1/9
=1000000-5999/9
=1000000-666又5/9
=(999999-666)+(1-5/9)
=999333+4/9
=999333又4/9
(-999 又2/3)平方
=(999 又2/3)平方
=(1000-1/3)²
=1000²-2×1000×1/3+(1/3)²
=1000000-2000/3+1/9
=1000000-6000/9+1/9
=1000000-5999/9
=1000000-666又5/9
=(999999-666)+(1-5/9)
=999333+4/9
=999333又4/9