9-16y=20-31y+15y найдите плис корень уровнения это для 6 класса

9-16у=20-31у+15у

9-16у=20-16у

-16у+16у=20-9

у=11

 

9-16y=20-31y+15

15у=26

у=26/15

1.    =  64х^2  -  48xy  +  9y^2  -32x^2  +  48xy  -  32x^2  =  9y^2 2.  4/5x^2  -  5  =  0         4x^2 / 5  =  5         4x^2  =  25         x^2  =  25/4         x = корень квадратный из 25/4       x1 = +2,5       x2 = -2,5

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