7а^2 - 42a +63 = 0 | *1\7
a^2 - 6a + 9 = 0
D = b^2 - 4ac = 36-36 = 0 = 0
a = -(b\2a) = -(-6\2) = 3
Ответ: а = 3
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7а^2 - 42a +63 = 0 | *1\7
a^2 - 6a + 9 = 0
D = b^2 - 4ac = 36-36 = 0 = 0
a = -(b\2a) = -(-6\2) = 3
Ответ: а = 3