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5x^2+x=2+x√(5x^2-1)5x^2-x√(5x^2-1)= 2-x(5x^2-1)- x√(5x^2-1)= 1 - x(5x^2-1)- x√(5x^2-1)+x^2/4 = x^2/4 - x +1{根號(5x^2-1)- x/2}^2 =(x/2 -1)^2根號(5x^2-1)= x/2±(x/2 -1)= x - 1,或1(一…
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