Przekształć wyrażenie algebraiczne do najprostszej postaci. a) 2(a-2b)-7(3a-b)=2a-4b-.....a+....b=.....a+....b b) 5(x - y)+ 2(4x+2y)-3(2x+y)= c) 5(x+2y-3z)- 2(4x-3y+z)= d) -(k-m-n)+2(k+2m+3n)- kmn= e) 2p(3p-2r)+ 3r(p-2r)=

a) 2(a-2b)-7(3a-b)=2a-4b²-21a+7b=-19a-4b²+7b b) 5(x - y)+ 2(4x+2y)-3(2x+y)=5x-5y+8x+4y-6x-3y=-4y+7x c) 5(x+2y-3z)- 2(4x-3y+z)=5x+10y-15z-8x+6y-2z=-3x+16y-17z d) -(k-m-n)+2(k+2m+3n)- kmn=-k+m+n+2k+4m+6n-kmn=-k+5m+7n-kmn e) 2p(3p-2r)+ 3r(p-2r)=6p²-4pr+3pr-6r²=6p²-pr-6r²

a) 2(a-2b)-7(3a-b) = 2a-4b-21a+7b = -19a+3b b) 5(x - y)+ 2(4x+2y)-3(2x+y)= 5x-5y+8x+4y-6x-3y = 7x-4y c) 5(x+2y-3z)- 2(4x-3y+z)= 5x+10y-15z-8x+6y-2z = -3x+16y-10z d) -(k-m-n)+2(k+2m+3n)- kmn= -k+m+n+2k+4m+6n-kmn = k+5m+7n-kmn e) 2p(3p-2r)+ 3r(p-2r)= 6p²-4pr+3pr-6r² = 6p²-pr-6r²