解方程x2分之xx24分之121要有详细答案(x+2)分之(x-2)-(x2-4)分之12=1(x+2)(x-2)分之(x-2)2-(x+2)(x-2)分之1-(x+2)(x-2)分之(x+2)(x-2)=0(x+2)(x-2)分之[(x2-4x+4-1-(x2-4)]=0(x+2)(x-2)分之(-4x+7)=0x+2≠0且x-2≠0且-4x+7=0x≠-2且x≠2且x=4分之7即x=4分之72,异度之刃2通关后做什么通关后第一件事把等级升满。把等级升满之后异刃开环,再去搞一些四级五级的核心过度把该