Question

Tính bằng cách thuận tiện : 8543-2541-4459+1457. 1282+2005+3546+4218+3495+1954

Answer 1

`8543 - 2541 - 4459 + 1457`

`= (8543+1457)-(4459+2541)`

`= 10000 - 7000`

`= 3000`

`1282+2005+3546+4218+3495+1954`

`= (1282+4218)+(2005+3495)+(3546+1954)`

`= 5500+5500+5500`

`= 5500xx3`

`= 16500`