xx(x-1）/2=105X=?
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xx(x-1）/2=105X=?xx(x-1）/2=105X=?xx(x-1）/2=105X=?x(x-1）/2=105x²-x=210x²-x-210=0(x-15)(x+14)
xx(x-1）/2=105X=?
xx(x-1）/2=105
X=?
xx(x-1）/2=105X=?
x(x-1）/2=105
x²-x=210
x²-x-210=0
(x-15)(x+14)=0
x=15或x=-14
7/xx+x+1/xx-1=2/xx-x
xx(x-1）/2=105X=?
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