因式分解 9分之M方N方 3分之2MN的立方 N的4次方-搜答案-大师作文网

(3m+2n)^2-(3m-2n)^2-60m=(3m+2n+3m-2n)(3m+2n-3m+2n)-60m=6m*4n-60m=24mn-60m=12m(2n-5)

(m+n分之m)+(m-n分之m)-(m方-n方,分之n方)=m(m-n)/(m^2-n^2)+m(m+n)/(m^2-n^2)-n^2/(m^2-n^2)=(m^2-mn+m^2+mn-n^2)/(

原式=m^2-2mn+n^2+3(m+n)=(m+n)^2+3(m+n)=(m+n)(m+n+3)

已知m^2-n^2=mn求m^2/n^2+n^2/m^2通分得m^4+n^4/m^2n^2而m^4+n^4=m^4-2m^2n^2+n^4+2m^2n^2=(m^2-n^2)^2-2m^2n^2=(m

4(m+n)的二次方-9(2m-n)的二次方=[2(m+n)]²-[3(2m-n)]²=(2m+2n+6m-3n)(2m+2n-6m+3n)=(8m-n)(-4m+5n)=(8m-

4（m+n)方-9（m-n）方=[2(m+n)]^2-[3(m-n)]^2=[2(m+n)+3(m-n)][2(m+n)-3(m-n)]=(5m-n)(-m+5n)

∵n分之m=3分之5∴n=3m/5(m+n分之m)+(m-n分之m)-(m方-n方,分之n方)=m/(m+n)+m/(m-n)-n²/(m²-n²)=(m²-m

你的描述看不懂,最好传题目的照片再问：再问：你帮我看看这题好了，答案写的是负根号下3再问：怎么来的啊，，怎么会有负再答：答案错了再问：还有还有一个，再答：还有一个什么？发过来再问：再问：原式那里你看看

(3m+2n)的二次方-(3m-2n)的二次方=(3m+2n+3m-2n)(3m+2n-3m+2n)=6m*4n=24mn2008+2008的二次方-2009的二次方=2008+(2008+2009)

(3m+n+1)·(3m-n)

m方+mn分之m方-n方=(m+n)(m-n)/m(m+n)=(m-n)/m

m/(m-n-m²+n²)=m/[(m-n)-(m²-n²)]=m/[(m-n)-(m+n)(m-n)]=m/(m-n)(1-m-n)=m(1+m+n)/(m-

m-mn+n=﹙m-2mn+n﹚=﹙m-n﹚=×2=×4=2

x^2-9=(x^2-6x+9)/22(x^2-9)=(x^2-6x+9)2(x-3)(x+3)-(x^2-6x+9)=02(x-3)(x+3)-(x-3)^2=0(x-3)[2(x+3)-(x-3)

=2/3(4/9x^2-y^2)=2/3(2/3x+y)(2/3x-y)另一个题=（3m+5）（m-4）

平方差原式=[2(2m+n)]²-[3(m-2n)]²=(4m+2n)²-(3m-6n)²=[(4m+2n)+(3m-6n)][(4m+2n)-(3m-6n)]

我看懂了

2a(m-n)的三次方+2a的三次方(n-m),=2a(m-n)的三次方-2a的三次方(m-n),=2a(m-n)[(m-n)²-1]=2a(m-n)(m-n-1)(m-n+1)

(m+n-3)^2

8m平方n四次方×(-4n立方分之3m)÷(-2分之m平方n)=-6m³n÷（-m²n/2）=3m如果本题有什么不明白可以追问,