Объяснение:
3.
x*(x-2)*(x+1)=x²*(x-1)
x*(x²-x-2)=x³-x²
x³-x²-2x=x³-x²
-2x=0 |÷(-2)
x=0.
ответ: х=0.
4.
a) 3x-3y+x²y-xy²=3*(x-y)+xy*(x-y)=(x-y)*(3+xy).
б) a³-8=a³-2³=(a-2)*(a²+2a+4).
5.
4x²-20xy+25y²=(2x)²-2*2x*5y+(5y)²=(2x-5y)²≥0.
Объяснение:
3.
x*(x-2)*(x+1)=x²*(x-1)
x*(x²-x-2)=x³-x²
x³-x²-2x=x³-x²
-2x=0 |÷(-2)
x=0.
ответ: х=0.
4.
a) 3x-3y+x²y-xy²=3*(x-y)+xy*(x-y)=(x-y)*(3+xy).
б) a³-8=a³-2³=(a-2)*(a²+2a+4).
5.
4x²-20xy+25y²=(2x)²-2*2x*5y+(5y)²=(2x-5y)²≥0.