2010 * 4 - 2010 * 4
=.......... r bạn tự tính
66-66=..........bạn tự tính
Cau 1:
Ban lay 4 so 2010 = 2010 x 4. Nhu vay 4 so 2010 - 2010 x 4 la het con so 1 so 2010 .Vay dap so:2010
Cau 2:
Co 11 so 6 ban lay 6 x 11 = 66.Nhu vay 66 - 66 = 0.Dap so:0
1) 2010+2010+2010+2010+2010-2010x4
=2010x5-2010x4
=2010x1=2010
2) 66-6+6+6+...+6
=6x11-6x11=0