Question

СРОЧНО ПОМОГИТЕ ПОЖАЛУЙСТА

Answer 1

1) (2m-y)(4m²+2my+y²)=2m*4m²+2m*2my+2m*y²-y*4m²-y*2my-y*y²=8m³+4m²y+2my²-4m²y-2my²-y³=8m³-y³
2) 20x²-(4x-7)(5x+3)=20x²-(4x*5x+4x*3-7*5x-7*3)=20x²-(20x²+12x-35x-21)=20x²-20x²-12x+35x+21=23x+21

3) b²(5b+3)(b²-b)=(b²*5b+b²*3)(b²-b)=(5b³+3b²)(b²-b)=5b³*b²+5b³*(-b)+3b²*b²+3b²*(-b)=5b^5-5b^4+3b^4-3b^3=5b^5-2b^4+3b^3