若(log2(3))^x-(log5(3))^x=(log2(3))^(-y)-(log5(3))^(-y)

若(log2(3))^x-(log5(3))^x>=(log2(3))^(-y)-(log5(3))^(-y)则A.x+y>0 B.x+y<0C.x+y>=0 D.x+y<=0怎么做？

热心网友

同底的整理结果为以2为底3的x+y次幂大于等于以5为底3的x+y次幂,,,做两函数的图象知,,自变量大于1时,,,不等式成立,,,即3的x+y次幂要大于1,,,所以答案为C.x+y=0