Tolong jwb yaa bsk sdh kumpul :)

B. 1) 245-189 = 56
2) 80 : 8 = 10
3) 90 × 2 = 180
4) 360 × 3 = 1080

C. 1) 1000 + (3000×2) = 7000 *karena kali di lebih dahulukan
2) 150 : 2 = 75
3) 200 – (200:2)= 200 – 100 = 100
4) 90 – 20 + 10 = 70 + 10 = 80

maaf kalo kurang caranya, semoga membantu