原式=[(m²-2m+1)/m²]÷[m-1-(m-1)/(m+1)]=[(m-1)²/m²]÷[(m-1)(m+1)/(m+1)-(m-1)/(m+1)]=[(m-1)²/m²]÷[(m²-1-m+1)/(m+1)]=[(m-1)²/m²]÷[(m²-m)/(m+1)]=[(m-1)&...