tuann

才能

Does anyone see my suffering by Luca Ponsato

Spider-Man suit Blueprint 🕷️

SPECIAL GRADE

“天空都市”

just do it!

(a+b)² = a² + 2ab + b² (a-b)² = a² - 2ab + b² (a+b+c)² = a² + b² + c² + 2ab + 2bc + 2ca (a+b)³ = a³ + 3a²b + 3ab² + b³ (a+b)³ = a³ + b³ + 3ab(a+b) (a-b)³ = a³ - 3a²b + 3ab² - b³ (a-b)³ = a³ - b³ - 3ab(a-b) (a+b+c)³ = a³ + b³ + c³ + 3(a+b)(b+c)(c+a) a³ + b³ = (a+b)(a² - ab + b²) a³ - b³ = (a-b)(a² + ab + b²) a³ + b³ + c³ - 3abc = (a+b+c)(a² + b² + c² - ab - bc - ca)