không thể tính hợp lý
`25 times 51 + 23 times 33 + 35 times 16`
`= 1275 + 759 + 560`
`= 2034 + 560`
`= 2594`
\(=25\times51+25\times33-2\times33+25\times16+10\times16\)
\(=25\times\left(51+33+16\right)+2\times33+2\times5\times16\)
\(=25\times100+2\times33+2\times16\times5\)
\(=2500+66+160\)
\(=2726\)