А) (a-1) 2+2 (a-1)+1=a2; б) (1-a) 2+2a (1-a)+a2=1; в) (x+1) 2 — 4

Question

А) (a-1) 2+2 (a-1)+1=a2; б) (1-a) 2+2a (1-a)+a2=1; в) (x+1) 2 — 4 (x+1)+4=(x-1) 2; г) (x+y) 2-2 (x+y) (x-y)+(x-y) 2=4y2.

Nennen · Accepted Answer

a2-2a+1+2a-2+1=a21-2a+a2+2a-2a2+a2=1x2+2x+1-4x+4+4=x2-2x+1x2+2xy+y2-2x2-2y2+x2-2xy+y2=4y2