Question

(m-n)²×(m+n)⁷

Answer 1

原式=[（m-n）^2 * (m+n)^2] * (m+n)^5

=(m^2-n^2) * (m+n)^5

=(m^2-n^2) * (m^5+5m^4*n+10m^3*n^2+10m^2*n^3+5m*n^4+n^5)

=(m^7+5m^6*n+10m^5*n^2+10m^4*n^3+5m^3*n^4+m^2*n^5)-

(m^5*n^2+5m^4*n^3+10m^3*n^4+10m^2*n^5+5m*n^6+n^7)

=m^7+5m^6*n+9m^5*n^2+5m^4*n^3-5m^3*n^4-9m^2*n^5-5m*n^6-n^7
如果只是化简的话到第二步就可以了，这个主要是5次方的公式查一下就出来了

Answer 2

(m-n)²×(m+n)⁷
=(m^2-n^2)^2*(m+n)^5
=(m^4-2m^2n^2+n^4)(m^5+5m^4n+10m^3n^2+10m^2n^3+5mn^4+n^5)
=……
剩下部分留给您练习，可以吗？