1) Якщо m = 211, то 29m + 31m – 40m = (29 + 31 – 40)m = 20m = 20 • 211 = 4220;
2) Якщо a = 40, то 15a – a + 10a = (15 – 1 + 10)a = 24a = 24 • 40 = 960;
3) Якщо x = 140, то 30x + 31x + 32x – 90x = (30 + 31 + 32 – 90)x = 3x = 3 • 140 = 420;
4) Якщо a = 11, то 10 + 5a + 6a – a = (5 + 6 – 1)a + 10 = 10a + 10 = 10 • 11 + 10 = 120.