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88888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888? 3 ? 88888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888
Bài 1 :1010+1111+1212+1313+....+8888
=101.(10+11+12+13+...+88)
=101.[(10+88).79:2]
=101.3871
=390971
Khoảng cách giữa các số là
1111-1010=101
Số số hạng là
(8888-1010):101+1=79 (số)
Tổng 1010+1111+…………+8888là
(8888+1010)x79:2=390 971
Đáp số: 390 971
1997-999-199
=1997-(999+199)
=1997-1198
=799
9999.8888=9.1111.8.1111
=1111.(9.8).1111
=11112.72
=88871112
=(2+8)+(22+88)+(222+888)+(2222+8888).
=10+110+1110+11110.
=10*(1+11+111+1111).
=10*1234.
=12340.
tk mk nha các bn
số 9 ở đố các bạn tìm ra số 9
hang thu 9
Ai tích mk mk sẽ tích lại