Объяснение:
а) (9а³+8b²)(8b²-9a³)=а) (8b²+9а³+)(8b²-9a³)=(8b²)²-(9a³)²=64b^4-81a^6;
б) (a³+3a²)²=(a³)²+2× a³×3a²+(3a²)²=а^6+6a^5+9a^4;
в) (x-3y)²(3y+x)²=((x-3y)(x+3y))²=(x²-9y²)²=(x²)²-2×x²×9y²+(9y²)²=x^4-18x²y²+81y^4;
Объяснение:
а) (9а³+8b²)(8b²-9a³)=а) (8b²+9а³+)(8b²-9a³)=(8b²)²-(9a³)²=64b^4-81a^6;
б) (a³+3a²)²=(a³)²+2× a³×3a²+(3a²)²=а^6+6a^5+9a^4;
в) (x-3y)²(3y+x)²=((x-3y)(x+3y))²=(x²-9y²)²=(x²)²-2×x²×9y²+(9y²)²=x^4-18x²y²+81y^4;