Question

решите задания дам 20 баллов​

Answer 1

Ответ:

$2)\ \ 2x^2+7xy-5x^2-11xy+3y^2=-3x^2-4xy+3y^2\\\\4b^2+a^2+6ab-11b^2-6ab=a^2-7b^2\\\\3a^2x+3ax^2+5a^3+3ax^2-8a^2x-10a^3=6ax^2-5a^2x-5a^3\\\\\\3)\ \ a)\ x=-15\ ,\ y=-4\\\\-x-3y-4+2y=-x-y-4=15+4-4=15\\\\b)\ \ p=-3\ ,\ q=-7\\\\2pq-2p-p+2q=2pq-3p+2q=2\cdot 3\cdot 7+3\cdot 3-2\cdot 7=37\\\\c)\ \ u=1\ ,\ v=-1\\\\3uv^2+u^2v^2-2uv^3+u^3v-u^4=3\cdot 1+1\cdot 1-2\cdot (-1)-1\cdot 1-1=3+1+2-1-1=4$