5х²-12х+7=0
D=12²-4×5×7=144-140=4=2²
x1=(12+2):10==1,4
x2=(12-2):10=1
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5х²-12х+7=0
D=12²-4×5×7=144-140=4=2²
x1=(12+2):10==1,4
x2=(12-2):10=1