Tính nhanh M = (100-1).(100-2^2) . (100 - 3^2) (100 - 50^2)
Giải thích
M = (100 – 1).(100 – 22). (100 – 32)…(100 – 502)
M = (100 – 1).(100 – 22). (100 – 32)… (100 – 92) .(100 – 102) .(100 – 112) …(100 – 502)
M = (100 – 1).(100 – 22). (100 – 32)… (100 – 92). (100 – 100) .(100 – 112) …(100 – 502)
M = (100 – 1).(100 – 22). (100 – 32)… (100 – 92) .0.(100 – 112) …(100 – 502)
M = 0
Vậy M = 0