? ?? ? ? A? B? C? D_????
...? ?? ? ? A? B? C? DC ??????????????????????? ,??????????????????? ......
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?f (x-1)=x???-1,?f?x??? - ????
...?f (x-1)=x???-1,?f?x????????x-1-=k,?x=k+1????????f (k) = (k+1)²-1=k²+2k?f (x)=x²+2x ????f (X-1)=X^2-1= (X-1)^2+2X-2+2-1-1= (X-1)^2+2 (X-1)f (X)=X^2+2X...
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?A,B?n???,??:AB?BA????????_????
...?A,B?n???,??:AB?BA????????????????AB?????????BA??????????? (1)??0????AB???????????x??ABx=?x???BA (Bx)=B (ABx)=B (?x)=?Bx??Bx?0???...
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?A,B???????,?P (AB) = 0,?????_????
...?A,B??? ??????P (AB) = 0? ???????????AB????????? ???????????????????????????????????????????????? (????)? ?????????????A?B?C????...
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???A? ??A?1?? ?_????
...????A?????? ??? 0.5 0 0 -1 -2 -1 0.5 1 1 ???A??A????????????????????????????????-1?????????????????????????1/2 0 0?????0 -2 -1?????0 1 1??????A ?? ......
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???z??1+z/1-z=i,?|z|=_????
...??????: ?????: ?????: ?1+z?/?1-z?=i 1+z=i-zi ?1+i?z=i-1 ??z=?i²+i?/?1+i?=i ??|z|=1 ?????: 1+ z ......
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?A?B?C??n?????AB=C??B????? ?A ...
...AB=C????????????????????????????????? ????A?????BA=C (??B??)??A??????C?????? ????A?????AB=C (??B??)??A??????C?????? ???????????? ????????2021?32?? ???????? ......
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?A??????|A|=2?A??????A*??|2A*|=??
...?A??????|A|=2?A??????A*??|2A*|=??????A*?AA*=?A?E?????????A??A*?=??A?E????A*?*2=?A?^3=8???A*?=4|2A*|=2^3*4=32????????????????????????A*?AA*=?A?E?????????A??A*?=??A?E? ???A*?*2=?A?^3=8 ???A* ......
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???a= (1,1,1), b= (2,3,4)??a×b = ?_????
...???a= (1,1,1), b= (2,3,4)??a×b = ????????????? ?????????? ?a (x,y,z) b (m,n,p) ? a??b=xm+yn+zp ?a? ......
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???????f (0)=0?f (x)??x=0??????? - ????
...f?0?=0??f?x???x=0???? ???? f?0?????????????? ?????? f?0????f?0????? ????? ??f?x?????????????f?x???????????????????????????????????? ???f?x?=|x|??x=0??????? ......
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