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3 câu trả lời 672
`(m-14)/10+(m-13)/9+(m-12)/8=(m+1)/(-5)+(m+2)/(-6)+(m+3)/(-7)`
`<=>(m-14)/10+(m-13)/9+(m-12)/8+(m+1)/5+(m+2)/6+(m+3)/7=0`
`<=>(m-14)/10+1+(m-13)/9+1+(m-12)/8+1+(m+1)/5-1+(m+2)/6-1+(m+3)/7-1=0`
`<=>(m-4)/10+(m-4)/9+(m-4)/8+(m-4)/5+(m-4)/6+(m-4)/7=0`
`<=>(m-4)(1/10+1/9+1/8+1/5+1/6+1/7)=0`
`<=>m-4=0` do `1/10+1/9+1/8+1/5+1/6+1/7>0`
`<=>m=4`.
Vậy `S={4}`
m−1410+m−139+m−128=m+1−5+m+2−6+m+3−7�-1410+�-139+�-128=�+1-5+�+2-6+�+3-7
⇔m−1410+m−139+m−128+m+15+m+26+m+37=0⇔�-1410+�-139+�-128+�+15+�+26+�+37=0
⇔m−1410+1+m−139+1+m−128+1+m+15−1+m+26−1+m+37−1=0⇔�-1410+1+�-139+1+�-128+1+�+15-1+�+26-1+�+37-1=0
⇔m−410+m−49+m−48+m−45+m−46+m−47=0⇔�-410+�-49+�-48+�-45+�-46+�-47=0
⇔(m−4)(110+19+18+15+16+17)=0⇔(�-4)(110+19+18+15+16+17)=0
⇔m−4=0⇔�-4=0 do 110+19+18+15+16+17>0110+19+18+15+16+17>0
⇔m=4⇔�=4.
Vậy S={4}
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