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stabiliti daca urmatoarele puncte sunt coliniare: a)A(-1;5);B(2,-4);C(3,-7); b)A(0,1);B(1,3);C(2,5)c)A(√2,2+√2);B(√3,3+√3);C(√5,5+√5);d)A(-5,-10);B(0,5);C(1,10)