Х - первое число, у - второе число
у = 0,7х
х =
![\frac{10}{7}](https://tex.z-dn.net/?f=+%5Cfrac%7B10%7D%7B7%7D+)
у
3^(x^2 + y^2) = 81
log 2(x) + 2log 4(y) = 1
<span>3^(x^2 + y^2) = 3^3 </span>
log 2(x) + 2log (2^2) (y) =1
<span>x^2 + y^2 = 3 </span>
log 2(x) + 2/2 * log 2(y) = 1
<span>x^2 + y^2 = 3 </span>
log 2(xy) = 1
<span>x^2 + y^2 = 3 </span>
2^1 = xy
<span>x^2 + y^2 = 3 </span>
xy = 2
<span>x = 2/y </span>
(2/y) * y = 2
<span>2 = 2 => x и у - любые числа, не = 0</span>
Объяснение:
(2x²-xy-2y²) -(?) = 4x²-xy
(?) = (2x²-xy-2y²) - (4x²-xy)
(?) = -2x²-2y²