Saved Bookmarks
| 1. |
и 4 = 3,и- - - ЧОfind u3 q y3 = ? |
|
Answer» 332/2 is the answer of this question x^2+y^2=40(x+y)^2-2xy= 40(3)^2-2xy= 40-2xy= 40-9=31xy= -31/2x^3+y^3= (x+y)^3-3xy(x+y) = (3)^3-3×(-31/2)×3 = 27+279/2 . = 54+279/2 = 333/2 x^2 + y^2=40,; ( x+y)^2=x^2+ y^2+2xy; x^2+y^2=( x+y)^2-2xy;(3)^2-2xy=40; 2xy=40-9=31; -2xy=31;; xy=-31/2;; x^3+y^3=( x+y)^3-3xy(x+y)= (3)^3-3x(-31/2)x3=27+279/2==333/2 332/2is the correct answer 333/2 is correct answer in this questions |
|