1)2m+5n-4n-6m+3n+m 2)3m+2n-5n-4m+7n-m 3)6x-3y+8y-4x+7 4)5x-7y+5y-2x+4 5) 5(2x-3y)+2(15y-3x) 6)4(2x-3y)-8(x+2y) дам 99 баллов

2m+5n-4n-6m+3n+m=(2m-6m+m)+(5n-4n+3n)=-3m+4n=4n-3m3m+2n-5n-4m+7n-m=(3m-4m-m)+(2n-5n+7n)=-2m+4n=4n-2m=2(2n-m)6x-3y+8y-4x+7=(6x-4x)+(-3y+8y)+7=2x+5y+75x-7у+5у-2х+4=(5х-2х)+(-7у+5у)+4=3х-2у+45(2х-3у)+2(15у-3х)=10х-15у+30у-6х=(10х-6х)+(-15у+30у)=4х+15у4(2х-3у)-8(х+2у)=8х-12у-8х-16у=(8х-8х)+(-12у-16у)=0-28у=-28у

1)2m+5n-4n-6m+3n+m=2m-6m+m+5n-4n+3n=-3m+4n2)3m+2n-5n-4m+7n-m =3m-4m-m+2n-5n+7n=-2m+4n3)6x-3y+8y-4x+7=6x-4x-3y+8y+7=2x+5y+74)5x-7y+5y-2x+4 =5x-2x-7y+5y+4=3x-2y+45) 5(2x-3y)+2(15y-3x)=10x-15y+30y-6x=10x-6x-15y+30y=4x+15y6)4(2x-3y)-8(x+2y)=8x-12y-8x-16y=8x-8x-12y-16y=-28y