Ответы на вопрос:
5 + (7x - 12): 3 = x + 13;
(7x - 12): 3 = x + 8;
7x - 12 = 3x + 24;
4x = 36;
x = 9;
Х= 5 / у х^2 = 25 / у^2 х^2 = 26 - у^2 25 / у^2 = 26 - у^2 25 = у^2( 26 - у^2 ) 25 = 26у^2 - у^4 у^4 - 26у^2 + 25 = 0 y^2 = a ; a > 0 d = 676 - 100 = 576 = 24^2 a1 = ( 26 + 24 ) : 2 = 25 a2 = ( 26 - 24 ) : 2 = 1 y^2 = 25 ==> y1 = 5 ; y2 = - 5 y^2 = 1 ==> y3 = 1 ; y4 = - 1 x = 5 / y x1 = 5 : 5 = 1 x2 = 5 : - 5 = - 1 x3 = 5 : 1 = 5 x4 = 5 : - 1 = - 5 ответ ( 1 ; 5 ) ; ( - 1 ; - 5 ) ; ( 5 ; 1 ) ; ( - 5 ; - 1 )
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