Tìm x biết:(x+1/2)+(x+3/2)+(x+5/2)=33
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\(x+\dfrac{1}{2}=\dfrac{33}{4}\\ \Rightarrow x=\dfrac{33}{4}-\dfrac{1}{2}\\ \Rightarrow x=\dfrac{31}{4}\\ \dfrac{5}{6}-x=\dfrac{1}{3}\\ \Rightarrow x=\dfrac{5}{6}-\dfrac{1}{3}\\ \Rightarrow x=\dfrac{1}{2}\\ x+\dfrac{4}{5}=\dfrac{-2}{3}\\ \Rightarrow x=\dfrac{-2}{3}-\dfrac{4}{5}\\ \Rightarrow x=\dfrac{-22}{15}\)
a: =>5(x+2)=170
=>x+2=34
=>x=32
b: =>x+2=5 hoặc x+2=-5
=>x=-7 hoặc x=3
c: =>x-2=1 hoặc x-2=-1
=>x=1 hoặc x=3
\(\frac{1}{2}.x+\frac{3}{5}.x=-\frac{33}{25}\)
\(\Leftrightarrow x.\left(\frac{1}{2}+\frac{3}{5}\right)=-\frac{33}{25}\)
\(\Leftrightarrow x.\frac{11}{10}=-\frac{33}{25}\)
\(\Leftrightarrow x=-\frac{33}{25}:\frac{11}{10}\)
\(\Leftrightarrow x=-\frac{6}{5}\)
Vậy \(x=\frac{6}{5}\)
\(\frac{1}{2}.x+\frac{3}{5}.x=-\frac{33}{25}\)
\(x.\left(\frac{1}{2}+\frac{3}{5}\right)=-\frac{33}{25}\)
\(x.\left(\frac{5}{10}+\frac{6}{10}\right)=-\frac{33}{25}\)
\(x.\frac{11}{10}=-\frac{33}{25}\)
\(x=-\frac{33}{25}:\frac{11}{10}\)
\(x=-\frac{33}{25}.\frac{10}{11}\)
\(x=-\frac{6}{5}\)
Vậy \(x=-\frac{6}{5}\)
Chúc bạn học tốt !!!
3/2+5/4+9/8/+17/16+33/32-6+x-1/x+1=31/32-2/2015
=(1+1/2)+(1+1/4)+(1+1/8)+(1+1/16)+(1+1/32-6+x-1/x+1=31/32-2/2015
=(1/2+1/4+1/8+1/16+1/32)+(1+1+1+1+1)-6+x-1/x+1=31/32-2/2015
=31/32+5-6+x-1/x+1=31/32-2/2015
=5-6+x-1/x+1=31/32-2/2015-31/32
=-1+x-1/x+1=-2/2015
=x-1/x+1=-2/2015- -1
=x-1/x+1=2013/2015
=>x=2014
\(a.x\left(x-5\right)\left(x+5\right)-\left(x+2\right)\left(x^2-2x+4\right)=3\)
\(\Leftrightarrow x\left(x^2-5^2\right)-\left(x^3+2^3\right)=3\)
\(\Leftrightarrow x^3-25x-x^3-8=3\)
\(\Leftrightarrow x^3-x^3-25x=8+3\)
\(\Leftrightarrow x=\frac{11}{-25}\)
Vậy x có nghiệm là \(\frac{-11}{25}.\)
\(\)
a) \(\left(x+1\right)\left(x+3\right)-x\left(x+2\right)=7\)
\(\Leftrightarrow x^2+4x+3-x^2-2x=0\)
\(\Leftrightarrow2x+3=0\Leftrightarrow x=-\frac{3}{2}\)
\(2x\left(3x+5\right)-x\left(6x-1\right)=33\)
\(\Leftrightarrow6x^2+10x-6x^2+x=33\)
\(\Leftrightarrow11x=33\Leftrightarrow x=3\)
x.3+1/2+3/2+5/2=33
x.3+9/2=33
x.3+4,5=33
x.3=33-4,5
x.3=28,5
x=28,5:3
x=9,5