Подобные слагаемые 2m-4m+5m 4x-8y-6x+11y -2m+3n-8m-n 18b-5b+3-9

2m-4m+5m=(2-4+5)*m=3m
4x-8y-6x+11y=(4-6)*х+(8-11)*у=-2х+3у
-2m+3n-8m-n=(-2-8)*m+(3-1)*n=-10m+2n
18b-5b+3-9=(18-5)*b+(3-9)=13b-6

-3m
3y-2x
2n-10m
13b-6