Ответы на вопрос:
(t1-t2)/(t4-t0)=(t2-t0)/(t3-t4)(t1-t2)*(t3-t4)=(t2-t0)* (t4-t0) t1t3- t2t3- t1t4+ t2t4= t2t4- t0t4- t0t2+(t0)² t1t3- t2t3+t0t2-(t0)² = t2t4- t0t4+t1t4- t2t4 t1t3- t2t3+t0t2-(t0)² = t4*(t2- t0+t1- t2) t3*(t1- t2)+ t0*(t2- t0) = t4 (t2- t0+t1- t2)
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