s-2t/3s×6s²/s+2t
s-2t/3s×6s²/s+2t =s-2t/3s*6s+2t =s-4t+2t =s-2t
答:(1)(s-2t)/3s = 6s^2(s+2t) ===> s-2t=18s^3(s+2t) (2)[(x-y)/(x+y)]/(x-y)^2 =[1/(x+...详情>>
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