n²(m-2)-6(2-m)
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(2m-n)/(n-m)+m/(m-n)+n/(n-m)=(2m-n)/(n-m)-m/(n-m)+n/(n-m)=(2m-n-m+n)/(n-m)=m/(n-m)欢迎采纳!
m+2m/n-m+n/m-n-2m/n-m=(m+2m-2m)/(n-m)+n/(m-n)=m/(n-m)+n(m-n)=-m/(m-n)+n/(m-n)=-(m-n)/(m-n)=-1
您好:(m+4n)(m-n)-6(m+2n)(m-3n)=m²+3mn-4n²-6m²+6mn+36n²=-5m²+9mn+32n²不明白,
2-n-1-m+m+2-m=3-m-n
(m-n)^2+n(n-m)原式=(n-m)^2+n(n-m)=(n-m)(n-m+n)=(n-m)(2n-m)因为完全平方所以(m-n)^2=(n-m)^2(a-b)(3r-t)+9(b-a)(2t
2+n(m-1)/m-m(n-2)/n
=m²-(25m²-9n²)+6(2m²+3mn-2n²)=m²-25m²+9n²+12m²+18mn-12n
m-{n-2m+[3m-(6m+3n)+5n]}=m-n+2m-[3m-(6m+3n)+5n]=3m-n-3m+(6m+3n)-5n=-6n+6m+3n=6m-3n
2m-n/n-m+m/m-n+n/n-m=(2m-n-m+n)/(n-m)=m/(n-m)
=(m²+3mn-4n²)-6(m²-mn-6n²)=m²+3mn-4n²-6m²+6mn+36n²=-5m²
(m+2n)-6(m+2n)(2m-n)+9(n-2m)=[m+2n+3(n-2m)]^2=(5n-5m)^2=25(n-m)^2
原式=m-[n-2m+(3m-6m-3n)-5n]=m-(n-2m+3m-6m-3n-5n)=6m+7n再问:那么(3a的平方-8a)+(2a的平方-13a的平方+2a)-2(a的立方-3)其中a=-
将m+n看作x,那么算式变成了x的方-6x+9,那么用平方公式一算,就是(x-3)的方,所以答案不就是(m+n-3)的方嘛!至于-3嘛,-3乘以2不就是-6嘛!希望采纳,谢谢!
﹙m-n﹚²+2n﹙m-n﹚=﹙m-n﹚﹙m-n+2n﹚=﹙m-n﹚﹙m+n﹚.
原式=(m-n)²+2(m-n)-6=(m+n-2)(m+n+3)
原式=(m²-mn-5mn+5n²)-6(m²-3mn+2mn-6n²)=(m²-6mn+5n²)-6(m²-mn-6n²
原式=3m(m+n)-6(m+n)(m-n)=(m+n)×【3m-6(m-n)】=(m+n)×(6n-3m)=3(m+n)(2n-m)
m-n+2n^2/(m+n)=[(m-n)(m+n)+2n^2]/(m+n)=(m^2+n^2)/(m+n)
这是要化简么...原式=m^2+3mn-4n^2-6(m^2-mn-6n^2)=-5m^2+9mn+32n^2