Ответы на вопрос:
1) 2(u-3)(u-1)=2*(u²-u-3*u+3)=2*(u²-4*u+3)=2*u²-8*u+6. 2) -(u-5)³=-1*(u-5)²*(u-5)=(5-u)*(u²-10*u+25)=5*u²-50*u+125-u³+10*u²-25*u=-u³+15*u²-75*u+125. 3) -u³+15*u²-75*u+125 *-2u²+8*u-6=-u³+13*u²-67*u+119 .
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