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\(\frac{1}{2}x+\frac{3}{5}\left(x-2\right)=3\)
\(\frac{1}{2}x+\frac{3}{5}x-\frac{3}{5}\cdot2=3\)
\(\left(\frac{1}{2}+\frac{3}{5}\right)x-\frac{6}{5}=3\)
\(\frac{11}{10}x-\frac{6}{5}=3\)
\(\frac{11}{10}x=3+\frac{6}{5}\)
\(\frac{11}{10}x=\frac{21}{5}\)
\(x=\frac{21}{5}:\frac{11}{10}\)
\(x=\frac{42}{11}\)
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2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.
nhé bạn
2 3 5 7 11 13 17 19 23 29 31 37 39 41 43 47 53 59 61 67 71 73 79 83 87 89 97
có 25 số nguyên tố nhỏ hơn 100
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a)\(\frac{x-1}{x+2\times0}=\frac{x-1}{x}\)
b)\(\frac{x+1}{x-3}=\frac{x-3+4}{x-3}=1+\frac{4}{x-3}>1\)
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-1+3-5+7-9+........+47-49
=(-1)+(3-5)+(7-9)+..........+(47-49)
=(-1)+(-2)+(-2)+..........+(-2)
=(-1)+(-2)x12(vì có 12 cặp)
=(-1)+(-24)
=-25
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2^X+2^X+3=144
\(\Rightarrow2^X.1+2^X.2^3=144\)
\(\Rightarrow2^X.\left(1+8\right)=144\)
\(\Rightarrow2^X.9=144\)
\(\Rightarrow2^X=144:9\)
\(\Rightarrow2^X=16\)
\(\Rightarrow X=4\)
Vậy x=4
( x - 2/5) = 1/3
x = 1/3 +2/5
x = 11/15
\(\left|x-\frac{2}{5}\right|=\frac{1}{3}\)
\(\Leftrightarrow x-\frac{2}{5}=\frac{1}{3}\Rightarrow x=\frac{1}{3}+\frac{2}{5}=\frac{11}{15}\)
hoặc \(x-\frac{2}{5}=-\frac{1}{3}\Rightarrow x=-\frac{1}{3}+\frac{2}{5}=\frac{1}{15}\)
Vậy \(x\in\left\{\frac{1}{15};\frac{11}{15}\right\}\)