2010 * 1985-2011 * 1984 simple algorithm

2010 * 1985-2011 * 1984 simple algorithm

Let 2010 be a and 1984 be B
Original formula = a (B + 1) - B (a + 1)
=AB+A-AB-B
=A-B
=26

2010 × 2010 / 2010, urgent, fast words will give points

2010 × 2010 of 2011
=2011×2010/2011-1×2010/2011
=2010-2010/2011
=January 2009 / 2011

Simple calculation: 20092010 * 20102009-20092009 * 20102010 ("*" stands for multiplication sign and "-" stands for subtraction sign)

20092010×20102009-20092009×20102010=20092010×20102009-20092009×(20102009+1)=20092010×20102009-20092009×20102009-20092009=20102009×(20092010-20092009)-20092009=20102009×1-20092009=20102009-2009...

Simple calculation. 20092010 * 20102009-20092009 * 201012010=

X*Y-(X-1)*(Y+1) = Y-X+1
Here x = 20092010, y = 20102009, so the original formula = 20102009-20092010 + 1 = 10000
Note: the last 20102010 in your title is wrongly written as 201012010