Question

Упростите выражение 0.1(7-y)(y+7)-1/2y(2y-5)+(y-3)^2

Answer 1

0.1(7-y)(y+7)-1/2y(2y-5)+(y-3)^2=-0.1y^2+4.9-y^2+2.5y+y^2-6y+9=-0.1y^2-3.5y+13.9 или $frac{-y^{2} }{10}$$frac{-7y}{2}$$frac{+139}{10}$