(根号MN)-(根号N分之M)/(根号N分之M)

问题描述:

(根号MN)-(根号N分之M)/(根号N分之M)

(√MN-√M/N)/√M/N
=√MN/√M/N-√M/N/√M/N
=(√MN*√N)/√M-1
=N√M/√M-1
=N-1