tolong bantuin nya ,,..plliseee

2.luas = 15*17= 255cm2
  keliling = 2*(15+17) = 2*32 = 64 cm
3.luas= 22.5*12= 270 cm2
  keliling = 2*(22.5+12) = 2*34.5= 69 cm
4.20/6 : 10/4 = 20/6*4/10 (dibalik) = 4/3 = 1  1/3

kasih jawaban yang terbaik ya ^_^
semoga membantu

1.L=15×17
=255cm2
K=2×(15+17)
=2×32
=64cm
2.L=22,5×12
=270cm2
K=2×(22,5+12)
=2×(34,5)
=69cm
3.3 2/6 ÷ 2 2/4 = 20/6 ÷ 10/4
=20/6 × 4/10
=80/60 = 4/3
MAAF BGT KLAU SALAH YA