x+ 75 phần trăm nhân với x\(=\frac{-5}{8}\)
chi tiết 2 tick
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\(\frac{-2}{x}=\frac{-x}{\frac{8}{25}}\)
=>\(\left(-x\right)x=\left(-2\right).\frac{8}{25}\)
=>\(-x^2=-\frac{16}{25}\)
=>\(x^2=\frac{16}{25}\)
=>\(x=-\frac{4}{5}\) hoặc \(x=\frac{4}{5}\)
\(-\frac{2}{x}=-\frac{x}{\frac{8}{25}}\Rightarrow-2.-\frac{8}{25}=x^2\Rightarrow\frac{16}{25}=x^2\Rightarrow x=\frac{\sqrt{16}}{\sqrt{25}}=\frac{4}{5}\)
\(\frac{\left(1,16-x\right).5,25}{\left(10\frac{5}{9}-7\frac{1}{4}\right).2\frac{2}{17}}=75\%\) <=> \(\frac{6,09-5,25x}{\left(\frac{95}{9}-\frac{29}{4}\right).\frac{36}{17}}=\frac{3}{4}\)<=> \(\frac{6,09-5,25x}{\frac{119}{36}.\frac{36}{17}}=\frac{3}{4}\)
<=> \(\frac{6,09-5,25x}{7}=\frac{3}{4}\)<=> 4(6,09-5,25x)=21 <=> 24,36-21x=21
=> 21x=3,36 => x=3,36:21 => x=0,16
Đáp số: x=0,16
a)
`9/2-3`
`=9/2-6/2`
`=3/2`
b)
`8/5xx25/12`
`=10/3`
c)
`4:3/7`
`=4xx7/3`
`=28/3`
b)\(\left(x-8\right)\left(x-2\right)=0\Leftrightarrow\orbr{\begin{cases}x-8=0\\x-2=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=8\\x=2\end{cases}}\)
c) \(\left(x+1\right)+\left(x+2\right)+...+\left(x+10\right)=9x+200\)
\(\Leftrightarrow\left(x+x+...+x\right)+\left(1+2+...+10\right)=9x+200\) (10 số hạng x)
\(\Leftrightarrow10x+55=9x+200\Leftrightarrow x+55=200\)
\(\Leftrightarrow x=145\)
\(2.x=\frac{1+2+3+...+9}{1-2+3-4+5-6+7-8+9}+\frac{25.150-60.5+20.75}{1+2+3+...+99}\)
\(2.x=\frac{\left(9+1\right).9:2}{\left(1-2\right)+\left(3-4\right)+\left(5-6\right)+\left(7-8\right)+9}+\frac{2.3.5^2.\left(5^2-2+2.5\right)}{\left(1+99\right).99:2}\)
\(2.x=\frac{45}{\left(-1\right)+\left(-1\right)+\left(-1\right)+\left(-1\right)+9}+\frac{2.3.5^2.33}{100.99.\frac{1}{2}}\)
\(2x=\frac{45}{5}+\frac{50.99}{50.2.99.\frac{1}{2}}=9+\frac{1}{2.\frac{1}{2}}=9+1=10\)
=> 2x = 10
x = 5
Ta có : x+75%.x=\(\frac{-5}{8}\)
=> x+0,75.x=\(\frac{-5}{8}\)
=> x+\(\frac{3}{4}\).x=\(\frac{-5}{8}\)
=> x.(1+\(\frac{3}{4}\))=\(\frac{-5}{8}\)
=> x.\(\frac{7}{4}\)=\(\frac{-5}{8}\)
=> x=\(\frac{-5}{14}\)
Vậy x=\(\frac{-5}{14}\)
Các bạn hãy tk cho mk nha !!!