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\(x:2+x:\frac{5}{2}+x:\frac{1}{3}=\frac{-18}{25}\)
\(x.\frac{1}{2}+x.\frac{2}{5}+x.3=\frac{-18}{25}\)
\(x.\left(\frac{1}{2}+\frac{2}{5}+3\right)=\frac{-18}{25}\)
\(x.\frac{39}{10}=\frac{-18}{25}\)
\(x=\frac{-18}{25}:\frac{39}{10}\)
\(x=\frac{-12}{65}\)
Chúc bn học tốt !!!
Ta có \(\frac{9}{25}x+\frac{3}{5}.\frac{9}{25}x+\frac{3}{5}.18+\frac{9}{25}x+18=x\)
=> \(\frac{9}{25}x\left(1+\frac{3}{5}+1\right)+18\left(\frac{3}{5}+1\right)=x\)
=> \(\frac{117}{125}x+28,8=x\)
=> \(x-\frac{117}{125}x=28,8\)
=> \(\frac{8}{125}x=28,8\)
=> x = 450
Vậy x = 450
\(\frac{9}{25}x+\frac{3}{5}.\frac{9}{25}x+\frac{3}{5}.18+\frac{9}{25}x+18=x\)
\(x\left(\frac{9}{25}+\frac{9}{25}+\frac{9}{25}\right).\frac{3}{5}+\frac{3}{5}.18+18=x\)
\(x.\frac{3}{5}\left(\frac{27}{25}+18\right)+18=x\)
\(x.\frac{3}{5}\left(\frac{27}{25}+\frac{450}{25}\right)+18=x\)
\(x.\frac{3}{5}.\frac{477}{25}+18=x\)
\(x.\frac{1431}{125}+\frac{2250}{125}=x\)
\(x.\frac{3681}{125}=x\)
vậy chac tui làm sai rồi
\(\frac{1}{2}x+\frac{2}{5}x=-\frac{18}{25}\)
\(\left(\frac{1}{2}+\frac{2}{5}\right)x=-\frac{18}{25}\)
\(\frac{9}{10}x=-\frac{18}{25}\)
\(x=-\frac{18}{25}:\frac{9}{10}\)
\(x=-\frac{4}{5}\)
~ Thiên Mã ~
1/2x+2/5x=-18/25
=>x(1/2+2/5)=-18/25
=>x*9/10=-18/25
=>x=-18/25:9/10
=>x=-4/5
~hok tốt~
k noa bn