Question

Уравнения алгебра 8 класс

Answer 1

Ответ:

$1)\;\;-y(y-8)+(y+3)^2 = -y^2+8y+y^2+6y+9 = 14y+9\\\\14*0.5+9 = 7+9 = 16\\\\\\2) \;\;(b+6)(b-6)-b(b+5) = b^2-36-b^2-5b = -5b-36\\\\-5*(-\frac{3}{5} )-36 = 3-36 = -33\\\\\\3)\;\;(3-x)^2+(4-x)(4+x) = 9-6x+x^2+16-x^2 = 25-6x\\\\25-6*(\frac{5}{6}) = 25-5 = 20$