<span>(1/7xy)⁴*(-49axy)²*(-2ay)⁶</span>= (1/2401x^4y^4)*(2401a^2x^2y^2)*(64a^6y^6) = 64a^8x^6y^12
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Х²-у=72
х+у=9
у=9-x
х²- (9-x) =72
х²-9+x -72 =0
х²+х -81=0
D= 1²- 4(-81) = 1+324=325
D>0 - два корня
x₁= (-1+5√13 )/2
x₂= (-1- 5√13) /2
y₁ =9- (-1+5√13)/2 = (18-(-1+5√13))/2=(19-5√13)/2
y₂= 9 - (-1-5√13)/2 = (18-(-1-5√13))/2= (19+5√13)/2
4x^2+12x+9-x^2+25=3x^2+12x+34=3*4-24+34=12-24+34=-12+34=22
(25x в квадрате-9у в квадрате)(3х+5)
75х в кубе-45х-27ху-45у