设（x-36)（x-144）-1991=m² m为正整数x²-36x-144x+5184-1991=m²x²-180x+8100-4907=m²(x-90)²-m²=4907(x-m-90)(x+m+90)=4907=7×701∴x-m-90=7 x+m+90=701解得x=354∴x=...