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\(2014.2013.2013.2012.x=2011.2012.2013.2014\)
\(\Rightarrow x=\dfrac{2011.2012.2013.2014}{2014.2013.2013.2012}\)
\(\Rightarrow x=\dfrac{2011}{2013}\)
Bạn xem lại đề
\(\left(84,6-2\cdot x\right):3,02=5,1\)
\(\Rightarrow84,6-2\cdot x=15,402\)
\(\Rightarrow2\cdot x=69,198\)
\(\Rightarrow x=69,198:2\)
\(\Rightarrow x=34,599\)
_____________
\(\left(15\cdot24-x\right):0,25=100:0,25\)
\(\Rightarrow\left(360-x\right):0,25=400\)
\(\Rightarrow360-x=100\)
\(\Rightarrow x-360-100\)
\(\Rightarrow x=260\)
______________
\(128\cdot x-12\cdot x-16\cdot x=5200\)
\(\Rightarrow x\cdot\left(128-12-16\right)=5200\)
\(\Rightarrow x\cdot100=5200\)
\(\Rightarrow x=5200:100\)
\(\Rightarrow x=52\)
__________________
\(5\cdot x+3,75\cdot x+1,25\cdot x=20\)
\(\Rightarrow x\cdot\left(5+3,75+1,25\right)=20\)
\(\Rightarrow10\cdot x=20\)
\(\Rightarrow x=20:10\)
\(\Rightarrow x=2\)
\(x\cdot3,7+x\cdot6,3=360:120\)
\(\Rightarrow x\cdot\left(3,7+6,3\right)=3\)
\(\Rightarrow x\cdot10=3\)
\(\Rightarrow x=\dfrac{3}{10}\)
__________________
\(x\cdot23-6\cdot23+x\cdot69=320\)
\(\Rightarrow x\cdot\left(23+69\right)=320+6\cdot23\)
\(\Rightarrow x\cdot92=458\)
\(\Rightarrow x=458:92\)
\(\Rightarrow x=\dfrac{229}{46}\)
___________________
\(\left(x+1\right)\left(x+2\right)=72\)
\(\Rightarrow x^2+2x+x+2=72\)
\(\Rightarrow x^2+3x+2=72\)
\(\Rightarrow x^2+3x+2-72=0\)
\(\Rightarrow x^2+3x-70=0\)
\(\Rightarrow x^2+10x-7x-70=0\)
\(\Rightarrow\left(x-7\right)\left(x+10\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=7\\x=-10\end{matrix}\right.\)
___________________
\(\left(x+2\right)\cdot16\cdot x=160x\)
\(\Rightarrow16x^2+32x=160x\)
\(\Rightarrow16x^2+32x-160x=0\)
\(\Rightarrow16x^2-128x=0\)
\(\Rightarrow16x\left(x-8\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x=8\end{matrix}\right.\)
`@` `\text {Ans}`
`\downarrow`
`a,`
\(x \div 0,1 + x \div 0,25 - 35 = 35\)
`\Rightarrow x * 10 + x * 4 - 35 = 35`
`\Rightarrow x*(10+4) - 35 = 35`
`\Rightarrow 14x - 35 = 35`
`\Rightarrow 14x = 70`
`\Rightarrow x=70/14 =5`
Vậy, `x=5`
`b,`
\(x \div 0,125 - x \div 0,5 = 108\)
`\Rightarrow x * 4/5 - x*2=108`
`\Rightarrow x*(4/5 - 2) = 108`
`\Rightarrow -6/5x = 108`
`\Rightarrow x=108 \div -6/5`
`\Rightarrow x=-90`
Vậy, `x=-90.`
a) x/0,1 + x/0,25 - 35 = 35
x . 10 + x . 4 = 35 + 35
14x = 70
x = 70 : 14
x = 5
0 nhân 25 hay 0,25
Vì 0 . 25 . x = 0 (số nào nhân 0 cũng bằng 0)
=> x = 2013