5/9+x/-1=-1/3 ai giúp mink tick
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\(\frac{1}{3}\cdot x+\frac{2}{5}\cdot\left(x-1\right)=4\)( Chú ý . là dấu nhân )
\(\frac{1}{3}\cdot x+\frac{2}{5}\cdot1+\frac{2}{5}\cdot x=4\)
\(\frac{1}{3}\cdot x+\frac{2}{5}+\frac{2}{5}\cdot x=4\)
\(\frac{2}{5}+x\cdot\left(\frac{1}{3}+\frac{2}{5}\right)=4\)
\(\frac{2}{5}+x\cdot\frac{11}{15}=4\)
\(x\cdot\frac{11}{15}=4-\frac{2}{5}\)
\(x\cdot\frac{11}{15}=\frac{18}{5}\)
\(x=\frac{18}{5}:\frac{11}{15}\)
\(x=\frac{54}{11}\)
(1+19)+(2+18)+(3+17)+(4+16)+(5+15)+(6+14)+(7+13)+(8+12)+(9+11)+20
=20+20+20+20+20+20+20+20+20+20
=20x10
=200
\(\left(x+\dfrac{1}{3}\right)\times\dfrac{9}{14}\times\dfrac{7}{3}-\dfrac{1}{3}=1:\dfrac{9}{5}\\ \Rightarrow\left(x+\dfrac{1}{3}\right)\times\dfrac{3}{2}-\dfrac{1}{3}=\dfrac{5}{9}\\ \Rightarrow\left(x+\dfrac{1}{3}\right)\times\dfrac{3}{2}=\dfrac{5}{9}+\dfrac{1}{3}\\ \Rightarrow\left(x+\dfrac{1}{3}\right)\times\dfrac{3}{2}=\dfrac{8}{9}\\ \Rightarrow x+\dfrac{1}{3}=\dfrac{8}{9}:\dfrac{3}{2}\\ \Rightarrow x+\dfrac{1}{3}=\dfrac{16}{27}\\ \Rightarrow x=\dfrac{16}{27}-\dfrac{1}{3}\\ \Rightarrow x=\dfrac{7}{27}\)
A=\(\frac{2.6.10+6.10.14+...+194+198+202}{1.3.5+3.5.7+...+97.99.101}\)\(=\frac{2.2.2\left(1.3.5\right)+2.2.2\left(3.5.7\right)+...+2.2.2\left(97.99.101\right)}{1.3.5+3.5.7+...+97.99.101}\)
\(=\frac{2.2.2\left(1.3.5+3.5.7+...+97.99.101\right)}{1.3.5+3.5.7+...+97.99.101}\)\(=\frac{2.2.2}{1}=8\)
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+....+\left(x+100\right)=5070.\)
\(\left(x+x+x+x+....+x\right)+\left(1+2+3+....+100\right)=5070\)
\(100x+101.100:2=5070\)
\(100x+5050=5070\)
\(100x=5070-5050=20\)
\(x=20:100=\frac{20}{100}=\frac{2}{10}=\frac{1}{5}=0,2\)
\(\left(x+\frac{1}{3}\right)^4=16\)
\(\Rightarrow\left(x+\frac{1}{3}\right)^4=2^4\)
\(\Rightarrow x+\frac{1}{3}=2\)
\(\Rightarrow x=2-\frac{1}{3}\)
\(\Rightarrow x=\frac{6}{3}-\frac{1}{3}\)
\(\Rightarrow x=\frac{5}{3}\)
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