Tìm x
100 - (80 nhân x + 32 ) : x = 12
2 con x đấy nhé -__-
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3 x 10 = 30
8 x 1000 = 8000
9000 x 100 =900000
80 x 100000=8000000
k nha
\(\dfrac{1}{1\cdot2}+\dfrac{1}{2\cdot3}+\dfrac{1}{3\cdot4}+.......+\dfrac{1}{x\cdot\left(x+1\right)}=\dfrac{122}{123}\)
\(\Leftrightarrow1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{4}+......+\dfrac{1}{x}-\dfrac{1}{x+1}=\dfrac{122}{123}\)
\(\Leftrightarrow1-\dfrac{1}{x+1}=\dfrac{122}{123}\)
\(\Leftrightarrow\dfrac{1}{x+1}=\dfrac{1}{123}\)
\(\Leftrightarrow x=122\)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
1!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
1/1 x 2 + 1/2x 3 + 1/3 x 4 + ... + 1/99 x 100
= 1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + ...+ 1/99 - 1/100
= 1 - 1/100
= 100/100 - 1/100
= 99/100
Chúc học giỏi !!! TK mình nha !!
\(x\) : 5 + \(x\) \(\times\) 80% = 32
\(x\) \(\times\) 0,2 + \(x\) \(\times\) 0,8 = 32
\(x\) \(\times\) ( 0,2 + 0,8) = 32
\(x\) x 1 = 32
\(x\) = 32
`a,`
\(x\times100=41,87\)
\(\Rightarrow x=41,87\div100\)
$-> x=0,4187$
`b,`
\(0,48\div x=1,2\)
\(\Rightarrow x=0,48\div1,2\)
\(\Rightarrow x=0,4\)
a: =>1170:(x-13)=39
=>x-13=1170/39=30
=>x=43
b: \(\Leftrightarrow x^{1000}\cdot x^{999}-x=0\)
=>\(x\left(x^{1998}-1\right)=0\)
=>\(\left[{}\begin{matrix}x=0\\x^{1998}-1=0\end{matrix}\right.\Leftrightarrow x\in\left\{0;1;-1\right\}\)
\(100-\left(80x+32\right):x=12\)
\(\left(80x+32\right):x=100-12\)
\(\frac{80x}{x}+\frac{32}{x}=88\)
\(80+\frac{32}{x}=88\)
\(\frac{32}{x}=88-80\)
\(\frac{32}{x}=8\)
\(\Rightarrow8x=32\)
\(\Rightarrow x=4\)
vay \(x=4\)