x方-1分之2-x方-x分之1

问题描述:

x方-1分之2-x方-x分之1

x方-1分之2-x方-x分之1
=(x-1)(x+1)分之2-x(x-1)分之1
=x(x-1)(x+1)分之2x-x(x-1)(x+1)分之x+1
=x(x-1)(x+1)分之(2x-x-1)
=x(x-1)(x+1)分之(x-1)
=x(x+1)分之1