公因式是mn(x-y)^n所以原式=mn(x-y)^n(n-m) 两项中m最低是1次,n最低原式1次而x-y是n和n+1次,则最低是n次所以公因式是mn(x原式=mn(x-y)^n*(-m)mn(x-y)^n*n(x-y)=mn(x-y)^n*[-m+n(x-y)]=mn(x-y)^n*(nx-ny-m)...