Question

Ex 1 ,...........................

Answer 1

Răspuns

Narcise:5 lei

lalele:7,3 lei

Explicație pas cu pas:

Luam ca sistem:

-notam cu L (lalelele) , N(narcisele)

=> 3L+4N=44 */(-2)

    6L+3N=63

=>-6L-8N=-88

    6L+3N=63 => -5N=-25 =>N=5 lei

=>3L+4*5=44=> 3L=22 => L=7,3 lei

Answer 2

$x - y +xy = 3\\xy(y-x)=-2\\xy(x-y)=2\\x-y=3-xy\\xy(3-xy)=2\\xy=2\\x-y=1\\x=y+1\\(y+1)y^2 - (y+1)^2y = -2\\y^3 + y ^2 - y^3 - 2y^2 - y = -2\\-y^2 - y = -2\\y^2 + y = 2\\y = 1\\x = 2$