1、2a²(3a²-5b)=6a^4-10a^2b
2、(-1/2x²y)(2/3y²-1/3x+1/4)=-1/3x^2y^3+1/6x^3y-1/8x^2y
3、6ab²(1-1/3ab^4)+(-2ab³)²=6ab^2-2a^2b^6+4a^2b^6=6ab^2+2a^2b^6
1、2a²(3a²-5b)=6a^4-10a^2b
2、(-1/2x²y)(2/3y²-1/3x+1/4)=-1/3x^2y^3+1/6x^3y-1/8x^2y
3、6ab²(1-1/3ab^4)+(-2ab³)²=6ab^2-2a^2b^6+4a^2b^6=6ab^2+2a^2b^6