(m-n/2m+2n)-m²+n²/m²-n²

问题描述:

(m-n/2m+2n)-m²+n²/m²-n²
计算 反正答案是-m+n/2m-2n

(m-n)/{2m+2n} - (m²+n²)/(m²-n²)= (m-n)/{2(m+n)} - (m²+n²)/{(m+n)(m-n)}= { (m-n)² - (m²+n²)/{2(m+n)(m-n)}= {m²+n² -2mn - 2(m²+n²)/{2(m+n...