Question

помогите дам 50 баллов!!!!
Срочно!!!!!​

Answer 1

Объяснение:

$1.\ -0,5x^2+y=-0,5*(-2)^2+(-3)=-0,5*4-3=-2-3=-5.$

$2.\ 3x^2*(2x^3-3x^2+1)=6x^5-9x^4+3x^2.\\3.\ (2x-1)*(6x+5)=12x^2-6x+10x-5=12x^2+4x-5.\\4.\ (3a-b)^2=9a^2-6ab+b^2.$

$5.\ 4a*(3a+2b)-b*(10a-b)=12a^2+8ab-10ab+b^2=12a^2-2ab+b^2.\\6.\ 2c*(c-3)+(2-c)^2=2c^2-6c+4-4c+c^2=3c^2-10c+4.$

$7.\ 4x^2+4xy+y^2=(2x)^2+2*2x*y+y^2=(2x+y)^2.$