Решите 100 2)x^2+7x-30=0 3)6x^2-x-1=0 4)4x^2-4x-3=0 5)2x^2-x-6=0 6)3x^2+4x-4=0 7)2x^2-2x-4=0 решите
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Ответы на вопрос:
2)x^2+7x-30=0 x1+x2=-7 u x1*x2=-30 x1=-10 u x2=3 3)6x^2-x-1=0 d=1+24=25 x1=(1-5)/12=-1/3 x2=(1+5)/12=1/2 4)4x^2-4x-3=0 d=16+48=64 x1=(4-8)/8=-0,5 x2=(4+8)/8=1,5 5)2x^2-x-6=0 d=1+48=49 x1=(1-7)/4=-1,5 x2=(1+7)/4=2 6)3x^2+4x-4=0 d=16+48=64 x1=(-4-8)/6=-2 x2=(-4+8)/6=2/3 7)2x^2-2x-4=0 d=4+32=36 x1=(2-6)/4=-1 x2=(2+6)/4=2
1) x = 3 и -10 по теореме виета 2) d = 1 + 24 = 25 x= 1 + 5/12 = 0.5 x = -4/12 = -1/3 3) 4x^2 - 4x -3=0 d = 16 + 48 = 64 x = 4 - 8 / 8 = -0.5 x = 12/8 = 1.5 4) d = 1 + 48 = 49 x = 1 - 7/ 4 = 1.5 x = 8/4 = 2 5) d = 16 + 48 = 64 x = -4-8 / 6 = -2 x = 4/6 = 2/3 6) d = 4 + 32 = 36 x = 8/4 = 2 x=-4/4 = -1
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