化简下列各式(其中各字母均为正数)?
化简下列各式(其中各字母均为正数)
1)看不清 (2) 5/6a^(1/3)b^(-2)(-3a^(-1/2)b^(-1)) /(4a^(2/3)b^(-3))^(1/2) =-5/2a^(1/3-1/2)b^(-2-1) /(2a^(1/3)b^(-3/2)) =-5/4a^(1/3-1/2-1/3)b^(-2-1+3/2) =-5/4a^(-1/2)b^(-3/2)
答:1: (x-3y)/(x^2-9y^2)=(x-3y)/((x+3y)(x-3y))=1/(x+3y)=1/(0+3*(-2))=-1/5 (3a^2-ab)/...详情>>
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