Предмет: Алгебра, автор: KyrmanNadezhda08

решите ример пож.
x(x-7)/3 - 1 = 11x/10 - x -4 /3

Ответы

Автор ответа: Аноним

[ X*( X - 7) / 3 ] - 1 = 11X/10 - ( X - 4)/ 3
общий знаменатель 30
10X*( X - 7 ) - 30 = 33X - 10*( X - 4 )
10X^2 - 70X - 30 = 33X - 10X + 40
10X^2 - 70X - 23X - 70 = 0
10X^2 - 93X - 70 = 0
D = 8649 + 2800 = 11449 ; √ D = 107
X1 = ( 93 + 107 ) : 20 = 10
X2 = ( 93 - 107 ) : 20 = - 0,7
ОТВЕТ 10 и ( - 0,7 )

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