1.已知3x^2-xy-4y^2=0(x不等于y),求x/y的值.2.解关于x的方程:(m-1)x^2+2mx+(m+3)=0.(m不等于1)
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(1)解:3x^2-xy-4y^2=(3X-4Y)(X+Y)=0 X/Y=4/3或X/Y=-1(2):X=｛-2M±√［4M＾2-4(M-1)(M+3)］｝/2(M-1)=［-M±√(3-2M)］/(M-1)
1.已知3x^2-xy-4y^2=0(x不等于y),求x/y的值.2.解关于x的方程:(m-1)x^2+2mx+(m+3)=0.(m不等于1)
(1)解:3x^2-xy-4y^2=(3X-4Y)(X+Y)=0 X/Y=4/3或X/Y=-1(2):X=｛-2M±√［4M＾2-4(M-1)(M+3)］｝/2(M-1)=［-M±√(3-2M)］/(M-1)