2x^(1/3)[1/2x^(1/3)-2x^(-2/3)]要解法上面的题错了2x^(-1/3)[1/2x^(1/3)-2x^(-_数学解答

2x^(1/3)[1/2x^(1/3)-2x^(-2/3)]要解法
上面的题错了2x^(-1/3)[1/2x^(1/3)-2x^(-2/3)]

人气：284 ℃　时间：2020-10-01 08:32:15

解答

2x^(-1/3)[1/2x^(1/3)-2x^(-2/3)]=x^(-1/3+1/3)-4(x^(-1/3-2/3))=x^0-4x^(-1)=1-4/x=(x-4)/x