Ответы на вопрос:
1) = ( 10a^5 )^2 - ( 1/2bc )^2 = 100a^10 - 1/4b^2c^2 2) ( 2y- 3 )( 3y + 1 ) + 2( y - 5 )( y + 5 ) = 2( 1 - 2y^2 ) + 6y 6y^2 + 2y - 9y - 3 + 2( y^2 - 25 ) = 2 - 4y^2 + 6y 6y^2 - 7y - 3 + 2y^2 - 50 = 2 - 4y^2 + 6y 8y^2 - 7y - 53 - 2 + 4y^2 - 6y = 0 12y^2 - 13y - 55 = 0 d = 169 + 2640 = 2809 = 53^2 y1 = ( 13 + 53 ) : 24 = 2,75 y2 = ( 13 - 53 ) : 24 = - 5/3 = - 1 2/3 3) ( 3x - 7 )^2 - 4x^2 = 0 9x^2 - 42x + 49 - 4x^2 = 0 5x^2 - 42x + 49 = 0 d = 1764 - 980 = 784 = 28^2 x1 = ( 42 + 28 ) : 10 = 7 x2 = ( 42 - 28 ) : 10 = 1,4
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