Question

解下列关于x或y的方程解方程：b^2x^2+2x^2-1=0；（2a-1）x=2（x-1）；b^2x^2+21=3(b≠

Answer 1

①b^2x^2+2x^2-1=0;

②(2a-1)x=2(x-1); ---->>(2a-3)x+2=0

③b^2x^2+21=3(b≠0);

④(b/2y)^2+3/4y^2=1/4b;

⑤x-b/a=2-(x-a)/b(a+b≠0)

①-②：2x^2-1-21=-3; ---->>x=+3;或-3;

代入③可得：b^2=-1;

代入4可得：1/4y^2+3/4y^2=-1/4; ---->>y^2=4

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