10 - 2(x+1)= 50
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50 x 2 + 8 x 50
= (2 + 8) x 50
= 10 x 50
= 500
10 + 10 + 10 + 50 + 50 + 10 + 10
= (10 x 5) + (50 + 50)
= 50 + 100
= 150
50 x 2 + 8 x 50
= 50 x ( 2 + 8 )
= 50 x 10
= 500
10 + 10 + 10 + 50 + 50 + 10 + 10
= 10 x 5 + 50 x 5
= 50 + 250
= 300
a: \(\Leftrightarrow\dfrac{7x+10}{x+1}\left(x^2-x-2-2x^2+3x+5\right)=0\)
\(\Leftrightarrow\left(7x+10\right)\left(-x^2+2x+3\right)=0\)
\(\Leftrightarrow\left(7x+10\right)\cdot\left(x^2-2x-3\right)=0\)
=>(7x+10)(x-3)=0
=>x=3 hoặc x=-10/7
b: \(\Leftrightarrow\dfrac{13}{\left(2x+7\right)\left(x-3\right)}+\dfrac{1}{2x+7}-\dfrac{6}{\left(x-3\right)\left(x+3\right)}=0\)
\(\Leftrightarrow13\left(x+3\right)+x^2-9-12x-42=0\)
\(\Leftrightarrow x^2-12x-51+13x+39=0\)
\(\Leftrightarrow x^2+x-12=0\)
=>(x+4)(x-3)=0
=>x=-4
\(\frac{2}{3}\cdot x+50\%+x=\frac{1}{10}\)
\(x\cdot\left(\frac{2}{3}+50\%+1\right)=\frac{1}{10}\)
\(x\cdot\left(\frac{2}{3}+\frac{1}{2}+1\right)=\frac{1}{10}\)
\(x\cdot\left(\frac{4}{6}+\frac{3}{6}+\frac{6}{6}\right)=\frac{1}{10}\)
\(x\cdot\frac{13}{6}=\frac{1}{10}\)
\(x=\frac{1}{10}:\frac{13}{6}\)
\(x=\frac{1}{10}\cdot\frac{6}{13}\)
\(x=\frac{6}{130}=\frac{3}{65}\)
a: \(=\dfrac{\left(\dfrac{1}{2}:\dfrac{1}{2}-\dfrac{1}{4}:\dfrac{1}{4}+\dfrac{1}{8}:\dfrac{1}{8}-\dfrac{1}{10}:\dfrac{1}{10}\right)}{1+2+3+...+2008}\)
=0
c: =8,1*5/3*1875+13,5*625
=13,5(1875+625)
=13,5*2500
=33750
a: =25(15+45*3)
=25*150
=3750
b: \(=-10\left(25+75-50\right)=-10\cdot50=-500\)
c: =>3^x-2=27
=>x-2=3
=>x=5
d: =>2x-5=-4
=>2x=1
=>x=1/2
e: =>2(x-1)^2=32
=>(x-1)^2=16
=>x-1=4 hoặc x-1=-4
=>x=-3 hoặc x=5
f: =>25(x+3)=75
=>x+3=3
=>x=0
\(\frac{2}{3}X+\frac{50}{100}+X=\frac{1}{10}\)
\(\frac{2}{3}X+\frac{1}{2}+X=\frac{1}{10}\)
\(\frac{2}{3}X+X=\frac{1}{10}-\frac{1}{2}\)
\(\frac{2}{3}X+X.1=\frac{1}{10}-\frac{5}{10}\)
\(X.\left(\frac{2}{3}+1\right)=-\frac{2}{5}\)
\(X.\frac{5}{3}=-\frac{2}{5}\)
\(X=-\frac{2}{5}:\frac{5}{3}\)
\(X=-\frac{6}{25}\)
10 . 58 . 5 + 32 . 2 . 25 + 50 . 10
= 50 . 58 + 50 . 32 + 50 . 10
= 50 . ( 58 + 32 + 10 )
= 50 . 100
= 5000
20 - 2 . ( x - 1 ) = 4
\(\Rightarrow\)2 . ( x - 1 ) = 16
\(\Rightarrow\)x - 1 = 16 : 2
\(\Rightarrow\)x - 1 = 8
\(\Rightarrow\)x = 9
( x + 1 )2 = 9 = 32 = ( -3 )2
\(\Rightarrow\orbr{\begin{cases}x+1=3\\x+1=-3\end{cases}\Rightarrow\orbr{\begin{cases}x=3-1\\x=3+1\end{cases}\Rightarrow}\orbr{\begin{cases}x=2\\x=4\end{cases}}}\)
10 - 2(x+1) = 50
2(x+1) = 10-50
2(x+1) = -40
x+1 = -40 : 2
x+1 = -20
x = -20 -1
x = -21