Ответы на вопрос:
A) x (x - 3) = 0 x = 0 x - 3 = 0 ==> x = 3 b) 4x + x^2 = 0 x (4 + x) = 0 x = 0 ; 4 + x = 0 ==> x = - 4 c) 3x^2 - 8x = 0 x (3x - 8) = 0 x = 0 ; 3x - 8 = 0 ==> 3x = 8 ==> x = 8/3 = 2,(6) d) y^2 + 6/7*y = 0 y( y + 6/7) = 0 y = 0 y+ 6/7 = 0 ==> y = - 6/7
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