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Đáp án + giải thích các bước giải:

`1/16:0,25-1/64:0,125+1xx0,2-1/5:0,1`

`=1/16xx4-1/64xx8+1xx0,2-1/5xx10`

`=4/16-8/64+1xx1/5-1/5xx10`

`=4/16-8/64+1/5-10/5`

`=1/4-1/8+1/5-2`

`=10/40-5/40+8/40-80/40`

`=5/40+8/40-80/40`

`=13/40-80/40`

`=-67/40`

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