X/6+y/6=2
x/16+y/8=2
x+y=12 |*-1 -x - y = -12
x+2y=32 | x +2y =32
+ ----------------
y = 20
x+y=12; x = 12 - 20; x = -8
Проверка: x+2y=32; -8 + 40 = 32; 32=32
-6х(х+2)+(х-2)(6х+4)=12
-6х² - 12х+6х²+4х-12х-8=12
-20х=20
х= - 1
3x^10y*12x^6y=3x^10y*(12x^6y)=3*(12(x^10y*x^6y)=3*(12x^16y)=36x^16y
1. = 4z³-8z²+4z;
2. = 9b²+6b-3b-2 = 9b²+3b-2;
3. = 8b-64b+1-8b = -64b+1;
4. = y²+14y+49.