1)упростите и вычислите ДРОБИ!! 2)Решите систему уравнений

1)
$\frac{15^4}{3^4*5^2*25}= \frac{3^4*5^4}{3^4*5^2*5^2}=1$

$( \frac{35}{48} )^3*( \frac{6}{7} )^3*(-1 \frac{3}{5} )^2= \\ \\ = \frac{(5*7)^3}{(16*3)^3}* \frac{(2*3)^3}{7^3}*(- \frac{8}{5} )^2= \\ \\ = \frac{5^3*7^3}{(2^4)^3*3^3}* \frac{2^3*3^3}{7^3}* \frac{(2^3)^2}{5^2}= \\ \\ = \frac{5^3*7^3*2^3*2^6*3^3}{5^2*7^3*2^{12}*3^3}= \frac{5}{2^3}= \frac{5}{8}$

2)
(x-5)²-(y-3)²=x²-y²
x²-10x+25-(y²-6y+9)=x²-y²
x²-x²-y²+y²-10x+6y=-16
-10x+6y=-16
-2(5x-3y)= -16
5x-3y=8
5x=8+3y

8+3y+3y=15
6y=15-8
6y=7
y=7/6
y=1 ¹/₆

5x+3* ⁷/₆=15
5x + ⁷/₂ =15
5x=15-3.5
5x=11.5
x=2.3

Ответ: (2,3; 1 ¹/₆)