Tolong di jawab dari nomor 1 sampe 3 ya kak ...

a)  L = SxS
       = (2a) x (2a)
       = 4a²
b) L = Px l
       = (3a) x (3b)
       = 9ab
c) L= SxS
     =(2s+t) x (3s)
     = 6s² + 3st

1. a. Luas = S x S = 2a x 2 a = 4a²
     b. Luas = P x L = 3a x 3 b = 9 ab
     c. Luas = 3s x (2s+t) = 6s²+3st
2. a. 10 x (2y-10) = (10 x 2 y) (10 x -10) = 20y-100
   b. (x+5) x (5x-1) = (x × 5x) (x×-1) (5×5x) (5×-1) = 5x²-x+25x+5 = 5x²+24x+5
   c. (7-2x) × (2x-7) = (7×2x) (7×-7) (-2x×2x) (-2x×-7) = 14x + -49 + -4x² + 14x =28x-49-4x²
3. -