1+n-m÷m²-n² --- ---- m+2n m²+4mn+4n²
问题描述:
1+n-m÷m²-n² --- ---- m+2n m²+4mn+4n²
1+n-m/m+2n÷m²-n²/m²+4mn+4n²
答
1+(n-m)/(m+2n)÷【(m²-n²)/(m²+4mn+4n²)】=1+(n-m)/(m+2n)÷【(m+n)(m-n)/(m+2n)²】=1+(n-m)/(m+2n)*(m+2n)²/【(m+n)(m-n)】=1-(m+2n)/(m+n)=【(m+n)-(m+2n)】/...