Ամփոփիչ դաս։
Առաջադրանքներ։
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1.
ա) 7
բ) 24.
գ)4/7.
2.
ա) 17.
բ) 10.
գ) 55.
դ) 10.
ե) 0,02.
3.
ա) √36 > √9.
բ) √16 < 5.
գ) √0,09 > 1/5
4.
ա) √x = 30,
x = 900.
բ) √x + 1 = 5,
x + 1 = 25,
x = 24.
գ) 3x² — 108 = 0,
3x² = 108,
x² = 36.
x = 6
x = -6
դ) 4x² — 8x = 0,
x(4x — 8) = 0,
x = 0,
4x — 8 = 0,
x = 2.
ե) 7x² + 5x — 2 = 0,
D = 25 + 4 × 2 × 7 = 81(9),
x1 = -5 + 9 : 14 = 2/7,
x2 = -5 — 9 : 14 = -1.
5.
x² — 10x + 9 = 0.
x1 = 1,
x2 = 2.