计算 2a^(-1/3) x [ 0.5a^(1/3) - 2a^(-2/3) ]
问题描述:
计算 2a^(-1/3) x [ 0.5a^(1/3) - 2a^(-2/3) ]
答
2a^(-1/3) x [ 0.5a^(1/3) - 2a^(-2/3) ]
=2a^(-1/3)*0.5a^(1/3)-2a^(-1/3)*2a^(-2/3)
=1-4a^(-1/3-2/3)
=1-4/a