Question

Выражение 3 примера #1] (m+3)*m^2-(m^2-1)*m+4(2-2m^2) #2] 2y(8y-5)-15(y^2-1)+2(2-y) #3]x^2(2x+3y)-x(3x^2+5xy) заранее !

Answer 1

1) = m^3 +3m^2 -m^3 +m +8 -8m^2 = -5m^2 +m +8
2)= 16y^2 -10y -15y^2 +15 +4 -2y = y^2 -12y +19
3)= 2x^3 +3x^2y -3x^3 -5x^2y =  -x^3 -2x^2y

Answer 2

$(m+3)\cdot m^2-(m^2-1)\cdot m+4(2-2m^2)=m^3+3m^2-m^3+m+8-8m^2=\\=-5m^2+m+8\\2y(8y-5)-15(y^2-1)+2(2-y)=16y^2-10y-15y^2+15+4-2y=\\=y^2-12y+19\\x^2(2x+3y)-x(3x^2+5xy)=2x^3+3yx^2-3x^3-5yx^2=-x^3-2yx^2$