-4x(2x²-5+3)=--4x*(-2)=8x-8x³;
(-½a)(-4a²-8a+6)=2a³+4a²-3a;
2ab(2²a-5ab+b²)=8a²b-10a²b²+2ab³;
-½xy•(5²x+10xy-4y²)=-12,5x²y-5x²y²+2xy³;
-4x(2x²-5+3)=--4x*(-2)=8x-8x³;
(-½a)(-4a²-8a+6)=2a³+4a²-3a;
2ab(2²a-5ab+b²)=8a²b-10a²b²+2ab³;
-½xy•(5²x+10xy-4y²)=-12,5x²y-5x²y²+2xy³;