Question

奥数题：77×13+255×999+510（简便计算）

Answer 1

原式=（100-13）*13+255*（1000-1）+510
=1300-169+255000-255+510
=256300-169+255
=256256

Answer 2

77×13+255×999+510
=1001+255×999+255×2
=1001+255×(999+2)
=1001+255×1001
=(1+255)×1001
=256×1001
=256256

Answer 3

77*13+255*999+510
=1001+255*999+255*2
=1001+255*(999+2)
=1001+255*1001
=1001*256
=256256

Answer 4

77×13+255×999+510
=77x13+255x999+255x2
=77x13+255x1001
=77x13+255x11*91
=77x13+255x11*7x13
=77*13*(255+1)
=1001*256
=256256