93879÷x=180(dư459)
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Ta có : 93879 : x = 180 dư 459
hay 93879 = 180 x x + 459
=>180 x x = 93879 -459=93420
=> x = 938420 : 180 = 519
Vậy x = 519
\(a,35\times x-9251=7269\\ 35\times x=7269+9251\\ 35\times x=16520\\ x=16520:35\\ x=472\)
\(b,2352:x=1792:32\\ \\ 2352:x=56\\ x=2352:56\\ x=42\)
\(c,x:204=112\left(dư.22\right)\\ x=204\times112+22\\ x=22848+22\\ x=22870\)
\(d,93879:x=108\left(dư.459\right)\\ x=\left(93879-459\right):108\\ x=93420:108\\ x=865\)
\(a,35\times x-9251=7269\)
\(35\times x=7269+9251\)
\(35\times x=16520\)
\(x=16520\div35\)
\(x=472\)
\(\dfrac{180}{x-4}-\dfrac{180}{x}=\dfrac{1}{2}\)
\(\Leftrightarrow\) \(\dfrac{2x\cdot180}{2x\left(x-4\right)}-\dfrac{2\cdot180\cdot\left(x-4\right)}{2x\left(x-4\right)}=0\)
\(\Leftrightarrow\) \(\dfrac{360x-360x+1440-x^2+4x}{2x\left(x-4\right)}=0\)
\(\Leftrightarrow\) \(\dfrac{-x^2+4x+1440}{2x\left(x-4\right)}=0\)
\(\Leftrightarrow-x^2+4x+1440=0\)
\(\Leftrightarrow-x^2+40x-36x+1440=0\)
\(\Leftrightarrow-x\cdot\left(x-40\right)\cdot\left(-36\right)\cdot\left(x-40\right)=0\)
\(\Leftrightarrow\left(x-40\right)\cdot\left(x-36\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x-40=0\\x+36=0\end{matrix}\right.\)
\(x-40=0\)
\(x=0+40\)
\(x=40\)
\(x+36=0\)
\(x=0-36\)
\(x=-36\)
\(\Leftrightarrow\left[{}\begin{matrix}x=40\\x=-36\end{matrix}\right.\)
\(180\left(\dfrac{1}{x-4}-\dfrac{1}{x}\right)=\dfrac{1}{2}\)
\(\dfrac{1}{x-4}-\dfrac{1}{x}=\dfrac{1}{360}\left(đk:x\ne0,4\right)\)
\(\dfrac{x-x+4}{x\left(x-4\right)}=\dfrac{1}{360}\)
\(\dfrac{4}{x\left(x-4\right)}=\dfrac{1}{360}\)
\(x^2-4x=1440\)
\(x^2-4x+4=1444\)
\(\left(x-2\right)^2=1444=38^2\)
\(\Leftrightarrow\left[{}\begin{matrix}x-2=38\\x-2=-38\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=40\\x=-36\end{matrix}\right.\)
=>9x+4y=360 và 36/x-36/y=1/2
=>4y=360-9x và 36/x-36/y=1/2
=>y=90-2,25x và \(\dfrac{36}{x}-\dfrac{36}{90-2,25x}=\dfrac{1}{2}\)
=>\(\dfrac{3240-81x-36x}{x\left(90-2,25x\right)}=\dfrac{1}{2}\)
=>90x-2,25x^2=2(3240-117x)
=>-2,25x^2+90x-6840+234x=0
=>x=118,3 hoặc x=25,7
=>y=-176,175 hoặc y=32,175
bằng 519 các bạn nha
=519 nha bn