已知A={y|y=x²+2mx+4,x∈R},B={x|(log3x)²+log1/3x≤0},且A

[log3(x)]²+log(1/3)(x)≤0[log3(x)]²-log3(x)≤0log3(x)[log3(x)-1]≤00≤log3(x)≤11≤x≤3对于函数y=x²+2mx+4,值域中包括[1,3]上的某一个或多个值。二次项系数1>0,函数开口向上,只要满足顶点纵坐标≤3即可。y=x²+2mx+4=(x+m)²+4-m²4-m²≤3m²≥1m≥1或m≤-1