y400-s400-y2s2
Объяснение:
(y10+s10)2-(y10-s10)2-Y2s2=(y20+s20)-(y20-s20)-y2s2=y20*2-20s*2-y2s2=y400-s400-y2s2
y400-s400-y2s2
Объяснение:
(y10+s10)2-(y10-s10)2-Y2s2=(y20+s20)-(y20-s20)-y2s2=y20*2-20s*2-y2s2=y400-s400-y2s2