Odpowiedź :
a)
[tex]4xy+(-2x-3y)-(-5x+y-5xy)=\\\\=4xy-2x-3y+5x-y+5xy=\\\\=4xy+5xy-2x+5x-3y-y=\boxed{9xy+3x-4y}[/tex]
b)
[tex]4k-(2m+n)-(-k-m)+(3m-n)=\\\\=4k-2m-n+k+m+3m-n=\\\\=4k+k-2m+m+3m-n-n=\boxed{5k+2m-2n}[/tex]
a)
[tex]4xy+(-2x-3y)-(-5x+y-5xy)=\\\\=4xy-2x-3y+5x-y+5xy=\\\\=4xy+5xy-2x+5x-3y-y=\boxed{9xy+3x-4y}[/tex]
b)
[tex]4k-(2m+n)-(-k-m)+(3m-n)=\\\\=4k-2m-n+k+m+3m-n=\\\\=4k+k-2m+m+3m-n-n=\boxed{5k+2m-2n}[/tex]