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= 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