1. (21x3) - 170+(-120)= 2. (-115 +45)x27:30= 3. 1.250+24x115-1.100 sama caranya trims

1. (21×3) - 170 + (-120)

= 63 - 170 + (-120)

= -107+ (-120)

= -227

2. (-115 + 45 ) × 27 : 30

= -70 × 27 : 30

= -1890 : 30

= -63

3. 1250 + 24 × 115 - 1100

= 1250 + 2760 - 1100

= 4010 - 1100

= 2910