Question

Алгебра 8 класс!!! Два примера! 25 баллов!!

Answer 1

$1)\\\frac{6c-c^2}{1-c} :\frac{c^2}{1-c} =\frac{c(6-c)*(1-c)}{(1-c)*c^2} =\frac{6-c}{c} \\\\c=1.2\\\\\frac{6-1.2}{1.2}=\frac{4.8}{1.2}=4\\\\Otvet:4\\\\2)\\(4+y)^2-y(y-1)=16+8y+y^2-y^2+y=9y+16\\\\y=-\frac{1}{9}\\ \\9*(-\frac{1}{9})+16=-1+16=15\\\\Otvet: 15$