Решите систему уравнений способом сложения{xf+x=18 {xf+f=14

27а^2*b^5*3a^10*b^3=81a^12*b^8

9х2-10а3+6ах-15ах2= 9х2+6ах-10а3-15ах2= 3х(3х+2а)-5а(2а2 + 3х2)

=15/7 (5/3  + 25*18/9*5) = 15/7  *  35/3 = 25

= (79/12  -  125/36)*5/2  -  (13/3)*(20/13) =  (112/36)*(5/2)  -  20/3 =

= 70/9  -  20/3 = 10/9.

= (7/9)*(9/7)  -  3,72  +  8 = 1 - 3,72 + 8 = 5,28.

= (7/4)*(7/55)*(11/7) = 7/20 = 0,35.

{x+y=82

{(y+-16)=2

{x+y=82

{y-x+32=2

{x+y=82

{ x-y=-30

x=82-y

y-82+y=-30

2y=-30+82

y=52/2

y=26

x=82-26

x=56