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lim x->無窮((2x-1)^30(x-2)^5)/(2x+1)^35分子分母同時除以x^35 =lim x->無窮[(2-1/x)^30*(1-2/x)^5]/(2+1/x)^35 x->無窮1/x,2/x->0 =2^30*1^5/2^35=1/2^5=1/32
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