tolong di jawab ya pliss butuh

1) a. 28 + 12 - (-158 - 48 + 30)
= 28 + 12 + 158 + 48 - 30
= 216

b. 13 × (-2) + (-54)
= (13 × (-2)) - 54
= -26 - 54
= -80

c. -68 - (-6 × 8 ) - (-98)
= -68 - (-48)+ 98
= -68 + 48 + 98
= 78

d. 540 × 34 - 19 × 480
= 18360 - 9120
= 9240

2) a. 12 + 9 : 3 - 12 : 2 = n
12 + 3 - 6 = n
9 = n

b. 38 × 75 - 2700 : 60 = n
2850 - 45 = n
2805 = n

c. 730 - 360 : 60 + 9 × 20 = n
730 - 6 + 180 = n
904 = n

d. 125 + 5 × 30 : 25 = n
125 + 150 : 25 = n
125 + 6 = n
131 = n

jadikan jawaban terbaik ya!!!!