Toán Lớp 7: Cho x+(1/x)=10. tính S=x^2+1/(x^2)
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Toán Lớp 7: Cho x+(1/x)=10. tính S=x^2+1/(x^2)
Comments ( 2 )
->S+2=x^2+2+1/x^2
->S+2=x^2+2*x^2*1/x^2+1/x^2
->S+2=(x+1/x)^2
->S+2=10^2
->S+2=100
->S=98
Vậy : S=x^2+1/x^2=98