решите уравнение, применяя формулу (6): 1) 3х²-14х+16=0; 2) х²+2х-80=0; 3) 15у²-22у-37=0; 4) 5х²-6х+1=0; 5) 4х²-36х+77=0; 6) х²-22х-23=0
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