1+n-m÷m²-n² --- ---- m+2n m²+4mn+4n²1+n-m/m+2n÷m²-n²/m²+4mn+4n²
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 23:34:42
![1+n-m÷m²-n² --- ---- m+2n m²+4mn+4n²1+n-m/m+2n÷m²-n²/m²+4mn+4n²](/uploads/image/z/3811218-42-8.jpg?t=1%2Bn-m%C3%B7m%26%23178%3B-n%26%23178%3B+---+----+m%2B2n+m%26%23178%3B%2B4mn%2B4n%26%23178%3B1%2Bn-m%2Fm%2B2n%C3%B7m%26%23178%3B-n%26%23178%3B%2Fm%26%23178%3B%2B4mn%2B4n%26%23178%3B)
1+n-m÷m²-n² --- ---- m+2n m²+4mn+4n²1+n-m/m+2n÷m²-n²/m²+4mn+4n²
1+n-m÷m²-n² --- ---- m+2n m²+4mn+4n²
1+n-m/m+2n÷m²-n²/m²+4mn+4n²
1+n-m÷m²-n² --- ---- m+2n m²+4mn+4n²1+n-m/m+2n÷m²-n²/m²+4mn+4n²
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)】/(m+n)
=-n/(m+n)