求x的值:(1)log2底(x²-2﹚=0;﹙2﹚log﹙2x²﹚底﹙3x²+2x-1﹚=1
问题描述:
求x的值:(1)log2底(x²-2﹚=0;﹙2﹚log﹙2x²﹚底﹙3x²+2x-1﹚=1
答
(1)x^2-2=1 => x^2=3 =>x=根号3或-根号3
(2)3x²+2x-1=2x^2 =>x^2+2x-1=0 =>(x+1)^2=2 =>x=-1+根号2或-1-根号2