搜搜做题作业网(m²-3n²) (m-3n)-(4m²-9n²) (2m-3n)
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/22 16:32:36
(m-n-3)^2={(m-n)-3}^2=(m-n)^2-6(m-n)+9=m^2-2mn+n^2-6m+6n+9
(m-n)2(n-m)7
(m+n)^3-(n+m)(m-n)^2=(m+n)[(m+n)^2-(m-n)^2]=(m+n)[(m+n+m-n)(m+n-m+n)]=(m+n)(2m+2n)=2(m+n)^2
n^3/m^3-m^3/n^3-(n/m-m/n)=(n/m-m/n)(n^2/m^2+1+m^2/n^2)-(n/m-m/n)=(n/m-m/n)(n^2/m^2+1+m^2/n^2-1)=(n/m
(2m+3n)(2m-3n)-(3m-2n)(3m+2n)=(4m²-9n²)-(9m²-4n²)=4m²-9n²-9m²+4n&
m/(m+n)+m/(m-n)-n²/((m²-n²)=(m²-mn+m²+mn-n²)/(m²-n²)=(2m&sup
这已经是最简形式了.
（n-m)^3×(m-n)^2-(m-n)^5=-(m-n)^3*(m-n)^2-(m-n)^5=-(m-n)^5-(m-n)^5=-2(m-n)^5
(3m-2n)²+(3m+2n)(3m-2n)-9(m+n)²=(3m-2n)²-9(m+n)²+(3m+2n)(3m-2n)=(3m-2n+3m+3n)(3m
3(m+n)+1.5(m-n)=3m+3n+1.5m-1.5n=4.5m+1.5n
设m-n为a（a^2*a^3）^2/a^4=a^6即（m-n）^6
解原式=-(m-n)³(m-n)²-(m-n)^5=-(m-n)^5-(m-n)^5=-2(m-n)^5
这题我会再答：先采纳一下吧亲我现在写草稿纸上写完直接拍照发给你再问：你能不能先发给我再问：大哥，速度再问：速度啊
-3n+5m-[m-5(m-n)+m]=-3n+5m-[m-5m+5n+m]=-3n+5m-[-3m+5n]=-3n+5m+3m-5n=8m-8n
m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=[m(m-n)+n(m+n)-n^2]/(m^2-n^2)=m^2/(m^2-n^2)=1/(1-(n/m)^2)=1/(1-(3/2)^2
已知m=5n,则原式=(5n/(5n+n))+(5n/(5n-n))-(n^2)/(((5n)^3)-n^2)=(5/6)+(5/4)-[1/(125n-1)]=(25/12)-[1/(125n-1)
[5m(3m-n)+2n(n-3m)]/(3m-n)=[5m(3m-n)-2n(3m-n)]/(3m-n)=(5m-2n)(3m-n)/(3m-n)=5m-2n
原式=2(m+n)^5÷[2(m+n)^3]-3(m+n)^4÷[2(m+n)^3]+(-m-n)^3÷[2(m+n)^3]=(m+n)^2-3(m+n)/2-1/2再问：��Ҳ�㵽��һ���ˣ��
3m（m－n）－2n（m－n）²＝（m－n）（3m－2mn＋2n²）