Question

Решите задания прошу

Answer 1

y=2x-7
2x²-3x(2x-7)+(2x-7)²-21=0
2x²-6x²+21x+4x²-28x+49-21=0
7x=28
x=4
y=8-7=1
(4;1)

1,1(1)=10/9
5,5(5)=50/9
50/9-100%
10/9-x%
x=10/9*100:50/9=(10*100*9)/(9*50)=20%