Tolong isi no 37,38,39,40 ya pake cara besok di kumpul

37)
p = 8 1/6 cm = 49/6 cm
l = 7 2/4 cm = 15/2 cm
Ditanya: K

K = 2p + 2l
K = 2(49/6) + 2(15/2)
K = 98/6 + 30/2
K = 49/3 + 15
K = 49/3 + 45/3
K = 94/3
K = 31 1/3 cm

38)
p = 120 cm
l = 80 cm
Ditanya: Perbandingan panjang dan lebar

p : l = 120 : 80
(p dan l sama-sama dibagi 40)
p : l = 3 : 2

39)
5 12/24 - 3 11/12 + 11/18
= 5 1/2 - 3 11/12 + 11/18
= 11/2 - 47/12 + 11/18
= 198/36 - 141/36 + 22/36
= 57/36 + 22/36
= 79/36
= 2 7/36

40)
8 2/6 × 3 6/10 : 12/15
= 8 1/3 × 3 3/5 × 15/12
= 25/3 × 18/5 × 5/4
= 30 × 5/4
= 150/4
= 75/2
= 37 1/2

37. panjang = 8 1/6 cm
= 8,16 cm
lebar = 7 2/4 cm
=7,5 cm
keliling =2 × (p+l)
=2×(8,16 + 7,5)
=2×15,6
=31,2 cm

38.panjang = 120 cm
lebar = 80 cm
perbandingan = 120 : 80
= 3. : 2
= 3/2

39.5 12/24 - 3 11/12 + 11/ 18
=5 18/36 - 3 33/36 + 22/36
= 2 7/36

40. 8 2/6 × 3 6/10 : 12/15
=25/3. × 18/5. ×15/12
=75/2 = 37,5
maaf kalo salah.