Toán Lớp 8: Tìm x>0 biết: x(x^3y-x) -x^2(x^2y-2) =4
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Toán Lớp 8: Tìm x>0 biết: x(x^3y-x) -x^2(x^2y-2) =4
Comments ( 2 )
$<=>x^4y-x^2-x^4y+2x^2=4$
$<=>x^2=4$
$<=>x=±2$