4/7+x*2=5/3
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\(x:\dfrac{1}{2}=\dfrac{3}{4}+\dfrac{5}{3}\\ \Rightarrow x:\dfrac{1}{2}=\dfrac{9}{12}+\dfrac{20}{12}\\ \Rightarrow x:\dfrac{1}{2}=\dfrac{29}{12}\\ \Rightarrow x=\dfrac{29}{12}\times\dfrac{1}{2}\\ \Rightarrow x=\dfrac{29}{24}\)
\(-\dfrac{1}{2}x+6< 0\Leftrightarrow-\dfrac{1}{2}x< -6\Leftrightarrow\cdot\dfrac{1}{2}x>6\Leftrightarrow x>12\)
(sai thì thoi nha)
\(-\dfrac{1}{2}x+6< 0\)
\(\Leftrightarrow-\dfrac{1}{2}x< -6\)
\(\Leftrightarrow x>\left(-6\right):\left(-\dfrac{1}{2}\right)\)
\(\Leftrightarrow x>12\)
--> Chọn A
\(2\sqrt{48}-3\sqrt{75}+5\sqrt{3}\)
\(=2\sqrt{16.3}-3\sqrt{25.3}+5\sqrt{3}\)
\(=2\sqrt{4^2.3}-3\sqrt{5^2.3}+5\sqrt{3}\)
\(=2.4\sqrt{3}-3.5\sqrt{3}+5\sqrt{3}\)
\(=8\sqrt{3}-15\sqrt{3}+5\sqrt{3}\)
\(=\left(8-15+5\right).\sqrt{3}\)
\(=-2\sqrt{3}\)
b: Ta có: \(\dfrac{12}{5}:x+\dfrac{4}{3}=3+\dfrac{2}{3}\)
\(\Leftrightarrow\dfrac{12}{5}:x=3-\dfrac{2}{3}=\dfrac{7}{3}\)
hay \(x=\dfrac{12}{5}:\dfrac{7}{3}=\dfrac{36}{35}\)
\(a.x+\dfrac{3}{7}=\dfrac{2}{5}:\dfrac{18}{35}\\x+\dfrac{3}{7}=\dfrac{2}{5}\times\dfrac{35}{18} \\ x+\dfrac{3}{7}=\dfrac{7}{9}\\ x=\dfrac{7}{9}-\dfrac{3}{7}\\ x=\dfrac{22}{63}\)
\(b.x\times\dfrac{5}{9}=\dfrac{4}{5}-\dfrac{1}{3}\\x\times\dfrac{5}{9}=\dfrac{7}{15}\\ x=\dfrac{7}{15}:\dfrac{5}{9}\\ x= \dfrac{21}{25}\)
a. x + \(\dfrac{3}{7}\)= \(\dfrac{2}{5}:\dfrac{18}{25}=>x+\dfrac{3}{7}=\dfrac{2}{5}\)x\(\dfrac{35}{18}=>x+\dfrac{3}{7}=\dfrac{7}{9}\)
=> x = \(\dfrac{7}{9}-\dfrac{3}{7}=\dfrac{49}{63}-\dfrac{27}{63}=\dfrac{22}{63}\)
b. \(x\) x \(\dfrac{5}{9}\)= \(\dfrac{4}{5}-\dfrac{1}{3}\)
=> \(x\) x \(\dfrac{5}{9}\)= \(\dfrac{12}{15}-\dfrac{5}{15}=>x\) x \(\dfrac{5}{9}\)= \(\dfrac{7}{15}\)
=> x = \(\dfrac{7}{15}:\dfrac{5}{9}\)
=> x = \(\dfrac{21}{25}\)
2/3 x X = 1/4 X x 1/5 = 1/2 X : 7/8 = 2/3
X = 1/4 : 2/3 X = 1/2 : 1/5 X = 2/3 x 7/8
X = 3/8 X = 5/2 X = 7/12
chúc bạn học tôt
\(\frac{4}{7}+x\times2=\frac{5}{3}\)
\(x\times2=\frac{5}{3}-\frac{4}{7}\)
\(x\times2=\frac{23}{21}\)
\(x=\frac{23}{21}:2\)
\(x=\frac{23}{42}\)
\(\frac{4}{7}+x\times2=\frac{5}{3}\)
\(x\times2=\frac{5}{3}-\frac{4}{7}\)
\(x\times2=\frac{23}{21}\)
\(x=\frac{23}{21}:2\)
\(x=\frac{23}{42}\)
Vậy x = 23/42