[Toán 9]rút gọn phân thức

T

thanhlan9

B=[TEX]\frac{(1-x)(1+x+...+x^2015)}{(1-x)(1+x+.. +x^31}[/TEX]
=[TEX]\frac{1-x^2016}{1-x^32}[/TEX]
=[TEX]\frac{(1-x^32)(1+x^32+(x^32)^2+....+(x^32)^62}{1-x^32}[/TEX]
=1+x^32+....+(x^32)^62
 
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