2 câu trả lời
`(x-280):35=56:x` `x>0`
`=>\frac{x-280}{35}=\frac{56}{x}`
`=>x(x-280)=56.35`
`=>x²-280x=1960`
`=>x²-280x-1960=0`
`=>`\(\left[ \begin{array}{l}x=140+14\sqrt[]{110}(TM)\\x=140-14\sqrt[]{110} (KTM)\end{array} \right.\)
Vậy `x=` $140 + 14\sqrt[]{110}$
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$\text{Vie}$
@Bulletproof
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