Đáp án`+`Giải thích các bước giải:
`9.24.25`
`= 9.6.4.25`
`= 54.100`
`= 5400`
------------------------------------
`12.125.54`
`= 3.4.125.2.27`
`= 1000.3.27`
`= 1000.81`
`= 81000`
------------------------------------
`64.125.54`
`= 8.8.125.54`
`= 1000.8.54`
`= 1000.432`
`= 432000`
-------------------------------------
`425.7.4-170.60`
`=(425.4).7-170.6.10`
`=1700.7-170.10.6`
`=1700.7-1700.6`
`=1700.(7-6)`
`=1700`
-------------------------------------
`8.9.14+6.17.12+19.4.18`
`= 2.4.9.14+2.3.17.4.3+2.4.9.19`
`=2.4.9.( 14+17+19)`
`= 72.50`
`= 3600`
