`4xx2,5xx13,251+0,25xx40`
`=4xx2,5xx13,251+0,25xx4xx10`
`=10xx13,251+10`
`=10xx13,251+10xx1`
`=10xx(13,251+1)`
`=10xx14,251`
`=142,51`
=10*13,251+10
=10*14,251
=142,51
\(4\times2,5\times13,251+0,25\times40=\left(4\times2,5\right)\times13,251+\left(0,25\times40\right)\)
\(=10\times13,251+10=132,51+10=142,51\)
`4 \times 2,5 \times 13,251 + 0,25 \times 40`
`= 4 \times 2,5 \times 13,251+ 2,5 \times 4`
`= 4 \times 2,5 \times (13,251+1)`
`= 4 \times 2,5 \times 14,251`
`= 10 \times 14,251=142,51`