Đáp án:
$x=\dfrac{75}8$
Giải thích các bước giải:
Ta có:
$\dfrac{2x-9}{20}=\dfrac{39}{80}$
$\to 80(2x-9)=780$
$\to 160x-720=780$
$\to 160x=1500$
$\to x=\dfrac{75}8$
Vậy $x=\dfrac{75}8$
$#Dino$
`(2x-9)/20=39/80`
`⇒80(2x-9)=780`
`⇒160x-720=780`
`⇒160x=780+720=1500`
`⇒x=75/8`
Vẫy `x=75/8`
Bạn hãy trả lời cho câu hỏi sau và nêu cảm nghĩ : “Tôi muốn nghe lại âm thanh ấy, nhưng cùng một lúc, tôi lại không muốn. Tôi muốn gặp lại cô ấy, nhưng cùng một lúc, tôi lại không muốn. Cậu gọi cảm xúc này là gì?” – Kousei Arima | Shigatsu wa Kimi no Uso
a)Người ta dùng mùn cưa chứa 50% xenlulozo làm nguyên liệu sản xuất rượi etylic . tính khối lượng mùn cưa để sản xuất 1 tấn rượi etylic biết hiệu xuất cả quá trình là 10% b) nếu thay mùn cưa bằng khoai chứa 20% tinh bột thì phỉa tốn bao nhiêu tấn khoai để 1 tấn rượi etyilc biết sự hao hụt trong sản xuất là 15%
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Cảm nhận của em về câu nói : “Sức mạnh thật sự của con người là khả năng tự thay đổi bản thân.” – Saitama | OnePunch-Man
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