由 kai 於 星期一 四月 24, 2006 8:52 pm
#ed_op#DIV#ed_cl#令x=-z#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#2x^2+y^2=y^3#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#y^2(y-1)=2x^2#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#取y=2k^2+1 k=1,2,3...#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#x=yk=2k^3+k#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#z=-x#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl#有無限多組#ed_op#/DIV#ed_cl#