14700 : ( x + 47 ) = 84
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75 x (x + 157) = 24450
x + 157 = 24450 : 75
x = 326 - 157
x = 169
14700 : (x + 47) = 84
x + 47 = 14700 : 84
x = 175 - 47
x = 128
69 x (x - 157) = 18837
x - 157 = 18837 : 69
x = 273 + 157
x = 430
41846 : (x - 384) = 98
x - 384 = 41846 : 98
x = 427 + 384
x = 811
7649 + X x 54 = 33137
X x 54 = 33137 - 7649
x = 25488 : 54
x = 472
35320 - X x 72 = 13072
X x 72 = 35320 - 13072
x = 22248 : 72
x = 309
4057 + (x : 38) = 20395
x : 38 = 20395 - 4057
x = 16338 x 38
x = 620844
21683 - (x : 47) = 4857
x : 47 = 21683 - 4857
x = 16826 x 47
x = 790822
`@` `\text {Ans}`
`\downarrow`
`A.`
`x-56 \times 24 = 286`
`x-1344 = 286`
`x=286 + 1344`
`x=1630`
`B.`
`65 \times 54 - x = 1026`
`3510 - x =1026`
`x=3510 - 1026`
`x=2484`
`C.`
`36 \times 84 \div x = 72`
`3024 \div x = 72`
`x=3024 \div 72`
`x=42`
`D.`
`x \div 47 = 326 - 277`
`x \div 47 = 49`
`x= 49 \times 47`
`x=2303`
A. \(x-56\times24=286\\ x-1344=286\\ x=286+1344\\ x=1630\)
B. \(65\times54-x=1026\\ 3510-x=1026\\ x=3510-1026\\ x=2484\)
C. \(36\times84\div x=72\\ 3024\div x=72\\ x-3024\div72\\ x=42\)
D. \(x\div47=326-277\\ x\div47=49\\ x=49\times47\\ x=2303\)
\(12x=15y=28z\)
\(\Rightarrow\dfrac{x}{35}=\dfrac{y}{28}=\dfrac{z}{15}\)
\(\Rightarrow\dfrac{x^3}{35^3}=\dfrac{y^3}{28^3}=\dfrac{z^3}{15^3}=\dfrac{xyz}{35.28.15}=\dfrac{14700}{14700}=1\)
\(\Rightarrow\left\{{}\begin{matrix}x=35\\y=28\\z=15\end{matrix}\right.\)
\(12x=15y=28z\Rightarrow\dfrac{x}{\dfrac{1}{12}}=\dfrac{y}{\dfrac{1}{15}}=\dfrac{z}{\dfrac{1}{28}}\)
Đặt \(\dfrac{x}{\dfrac{1}{12}}=\dfrac{y}{\dfrac{1}{15}}=\dfrac{z}{\dfrac{1}{28}}=k\Rightarrow x=\dfrac{1}{12}k;y=\dfrac{1}{15}k;z=\dfrac{1}{28}k\)
\(xyz=14700\\ \Rightarrow\dfrac{1}{12}k\cdot\dfrac{1}{15}k\cdot\dfrac{1}{28}k=14700\\ \Rightarrow\dfrac{1}{5040}k^3=14700\\ \Rightarrow k^3=74088000\\ \Rightarrow k=420\\ \Rightarrow\left\{{}\begin{matrix}x=35\\y=28\\z=15\end{matrix}\right.\)
14700:(x+47)=84
(x+47)=14700:84
x+47=175
x=128
nha bn
14700:(x+47)=84
x+47 =14700:84
x+47 =175
x=175-47
x=128
Vậy x=128