Question

根号2+1除以根号2-1 - 根号2-1除以根号2+1

Answer 1

原式=(√2+1)²/(√2+1)(√2-1)-(√2-1)²/(√2+1)(√2-1)

=(2+2√2+1)/(2-1)-(2-2√2+1)/(2-1)

=3+2√2-3+2√2

=4√2