tolong jawab no 2 dog dan pakai cara ya

L = 3/5 + 1/4 + 45 m²
L = 17/20 + 45 m²
L = 17/20 + 3/ 20

3/20 = 45
17/ 20 = x

3/20 :17/20 = 45 : x
3/20 . 20/17 = 45 : x
3/17 = 45/x
3x = 45 . 17
3x = 765
x = 765/3
x = 255 m²

255 + 45 = 300 m²