Пожалуйста, помогите решить эти примеры!

1.
1)(m+n)(m-mn+n)/(m+n)-mn=m-mn+n-mn=m-2mn+n=(m-n)
2)(m-n)*(m+n)/(m-n)=(m-n)/(m-n)=1
2.
1)((m+m-4m)-(m-m-4m))/m-m+4m=(m+m-4m-m+m-4m)(m+m-4m+m-m-4m)/4m=2m-4m*2m/4m=m-4m
2)m-4m:m-4m/2=m-4m*2/m-4m=2
3.
1)(2x-2+2x+2)/4x-2=4x/2(2x-1)=2x/2x-1
2)2x/2x-1 * 2(2x-1)=4x
4.
1)((x+2+x-4)+(x+2-x-4))/((x+2)-(x-4))=(((x+2)+2(x+2)x-4+x-4+(x+2)-2(x+2)x-4+x-4)/(x+4x+4-x+4)=2((x+2)+x-4)/4(x+2)=2(x+4x+4+x-4)/2(x+2)=4x(x+2)/4(x+2)=x(x+2)/(x+2)
2)x(x+2)/(x+2)*1/x=(x+2)/(x+2)
5.
1)(2+(a+1)-(a+3)(a-1))/(a-1)=(2+a+2a+1-a+a-3a+3)/(a-1)=(6-2a)/(a-1)=2(3-a)/(a-1)
2)2(3-a)/(a-1)*(a-1)/2=3-a
6.
x*2yx/(x+y)+y*2xy/(x+y)=(x*2yx+y*2xy)/(x+y)=2xy((x+y)/(x+y)=2xy