Question

(2x-1)的平方=3,求x 求使根号x+1加上根号x-1有意义的x取值范围,

Answer 1

(2x-1)²=3

(2x-1)²-3=0

(2x-1-√3)(2x-1+√3)=0

x=(1+√3)/2或x=(1-√3)/2

√(x+1)+√(x-1)

√(x+1)>=0,√(x-1)>=0

x>=-1,x>=1

x取值范围为:x>=1