1）令t=1/2^x,x∈(-1,1),则t∈(1/2,2)y=t^2-2t-3=(t-1)^2-4ymin=y(1)=-4ymax=y(2)=-3所以函数值域为(-4,-3)2)令g(x)=-x^2+2x+3=-(x-1)^2+4,开口向下,对称轴为x=1x∈[0,4]当x∈[1,4]时,g单调减,y单调增当x∈[0,1]时,g...