Ответы на вопрос:
1) X1 = 13, X2 = -15
2) X1 = 6, X2 = 1
3) X1 = 1, X2 = -2006
Объяснение:
1) x²+2x-195=0
a =1, b =2, c = -195
D = b²-4ac
D = 4-4·1·(-195) = 4+780 = 784
D>0, 2 корня
X1/2 = = = X1 = 13, X2 = -15
2) 3x²-7x+2=0
a = 3, b = -7, c = 2
D = b²-4ac
D = (-7)²-4·3·2 = 25
D>0, 2 корня
X1/2 = = = X1 = 6, X2 = 1
3) x²+2005x-2006=0
a = 1, b = 2005, c = -2006
D = b²-4ac
D = 2005²-4·1·(-2006) = 4.028.049
D>0, 2 корня
X1/2 = = = X1 = 1, X2 = -2006
1) (0,5-5х)2+0,75=(5х-4)2 -24,5х+0,75=-11х -35,5х=0,75 х=-47,3 2)х2+2х-х2-3х-3х-9=13 -4х=22 -х=5,5 3)4х2-4х-2х2-10х-10х-25-1 2х2+16х-24=0 d=256-192=64 х1=2÷16+8=24÷2=12 х2=2÷16-8=8÷2=4
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