∛(5x+7) = -2
5x+7 = (-2)³
5x+7= -8
5x=-8-7
5x= -15
x= -3
Ответ: -3
1
9/(x+3)²+18/(x-3)(x+3)+9/(x-3)²=(9x²-54x+81+18x²-162+9x²+54x+81)/(x²-9)²=
=36x²/(x²-9)²
2)(x/3-3/x)²=(x²-9)²/9x²
3)36x²/(x²-9)² *(x²-9)²/9x²=4
57*79=4503 57*69=3933 10*43=430 4503-3933=570 570+430=1000