log2{4-x}-log2{√(x-1)}>1log2{(4-x)/√(x-1)}>1(4-x)/√(x-1)>24-x>2√(x-1)x^2-8x+16>4x-4x^2-12x+20>0x<2或x>10又1所以1
先要换成同底吧
