阅读,计算m平方-9分之12 3-m分之2-搜答案-拍题作业网

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

12/(m²-9)-2/(m-3)=12/(m²-9)-2(m+3)/(m²-9)=[12-2(m+3)]/(m²-9)=-2(m-3)/(m²-9)

因为(M^2-N^2)＝（M+N）（M—N）所以原式＝[（M+N）/(M-N)]*(M-N)^2/[(MN)^2(M+N)]=(M-N)/(NM)^2

2a(a+b)^2-8ab^2=2a(a^2+2ab+b^2)-8ab^2=2a^3+4a^2b+2ab^2-8ab^2=2a^3+4a^2b-6ab^2=2a(a^2+2ab-3b^2)=2a(a+

[m(m-3)]/[(3+m)(3-m)]=-m/(3+m)分母平方差公式;分子提公因式

9m^2/(-3m-n)+n^2/(n+3m)=(3m)^2/-(3m+n)+n^2/(n+3m)=(n^2-(3m)^2)/(n+3m)=(n+3m)(n-3m)/(n+3m)=n-3m

4m的平方—9分之2m的平方+m—3=(2M+3)(2M-3)分之(2M+3)(M-1)=(2M-3)分之(M-1)再问：x-1分之x-3除以x的平方+2x+1分之x-3-x-1分之1化简后代入x=根

1、=a/(a-4)-4/(a-4)=(a-4)/(a-4)=12、=4/(m+2)(m-2)-(m+2)/(m+2)(m-2)=(4-m-2)/(m+2)(m-2)=-(m-2)/(m+2)(m-2

化简m的平方减去9分之m的平方减去3m+m+3分之3=m方-（m/9）方-（3m+m+1）=m方-（m/9）方-4m-1=80m方-324m-81

(M-3分之1)(M的平方+9分之1)(M+3分之1)=(M-3分之1)(M+3分之1)(M的平方+9分之1)=(M²-9分之1)(M²+9分之1)=M的4次方-81分之1很高兴为

(m/n+n)(m/n+n)-(m/2-n)(m/2-n)=[(m/n+n)+(m/2-n)][(m/n+n)-(m/2-n)]=m*m(1/n/n-1/4)

1.(3m+3n)/(n-m)2.-(55x+1)/9

因为m=-3分子式无意义,所以m不等于-3m+3/(9-m2)m+3/(3-m)*(3+m)1/3-m

9-m分之m的平方-3m

写错了吧应该是(m²-3m)/(9-m²)=-m(m-3)/(m+3)(m-3)=-m/(m+3)

ab+a-mb-m=b(a-m)+(a-m)=(b+1)(a-m)（1-2的平方分之1）（1-3的平方分之1）（1-4的平方分之1）……（1-9的平方分之1）（1-10的平方分之1）=(1-1/2)(

再答：亲，满意吗，别忘了好评哦

=12/(m+3)(m-3)-2/(m-3)+1/(m+3)=12/(m+3)(m-3)-2(m+3)/(m+3)(m-3)+(m-3)/(m+3)(m-3)=(12-2m-6+m-3)/(m+3)(

=(m-4)/(m+3)(m-3)×(m²+2m-3)/(m²-8m+16)×(m-3)=(m-4)/(m+3)×(m+3)(m-1)/(m-4)²=(m-1)/(m-4

=12/(m+3)(m-3)-2/(m-3)=12/(m+3)(m-3)-2(m+3)/(m+3)(m-3)=(12-2m-6)/(m+3)(m-3)=-2(m-3)/(m+3)(m-3)=-2/(m