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a)\(\frac{5}{9}\times x-1=\frac{8}{9}\)
\(\frac{5}{9}\times x=\frac{8}{9}+1\)
\(\frac{5}{9}\times x=\frac{17}{9}\)
\(x=\frac{17}{9}:\frac{5}{9}\)
\(x=\frac{17}{5}\)
\(x+x\times\frac{1}{4}\div\frac{2}{7}+x\div\frac{2}{9}=255\)
\(\Rightarrow x+x\times\frac{1}{4}\times\frac{7}{2}+x\times\frac{9}{2}=255\)
\(\Rightarrow x+x\times\frac{7}{8}+x\times\frac{9}{2}=255\)
\(\Rightarrow x.\left(1+\frac{7}{8}+\frac{9}{2}\right)=255\)
\(\Rightarrow x\cdot\frac{51}{8}=255\)
\(\Rightarrow x=255\div\frac{51}{8}\)
\(\Rightarrow x=255\times\frac{8}{51}\)
\(\Rightarrow x=40\)
Vậy x = 40
a)\(x+\dfrac{2}{3}x\dfrac{5}{6}=7\)
\(x+\dfrac{10}{18}=7\)
\(x=7-\dfrac{10}{18}\)
\(x=\dfrac{58}{9}\)
b)\(9-xx\dfrac{1}{2}=\dfrac{3}{4}\)
\(xx\dfrac{1}{2}=9-\dfrac{3}{4}\)
\(xx\dfrac{1}{2}=\dfrac{33}{4}\)
\(x=\dfrac{33}{4}:\dfrac{1}{2}\)
\(x=\dfrac{33}{2}\)
c)\(18-x:\dfrac{2}{3}=\dfrac{4}{5}-\dfrac{1}{10}\)
\(18-x:\dfrac{2}{3}=\dfrac{7}{10}\)
\(x:\dfrac{2}{3}=18-\dfrac{7}{10}\)
\(x:\dfrac{2}{3}=\dfrac{173}{10}\)
\(x=\dfrac{173}{10}x\dfrac{2}{3}\)
\(x=\dfrac{173}{15}\)
y+y x 1/3 : 2/9 + y :2/7 = 252
y x 1 + y x (1/3 x 9/2 ) + y x 7/2 = 252
y x 1/1 + y x 3/2 + y x 7/2 = 252
y x (1/1 + 3/2 + 7/2 ) = 252
y x 6 = 252
y = 252 : 6
y = 42
\(x+x×\frac{1}{3}:\frac{2}{9}+x×\frac{2}{7}=252\)
\(\Rightarrow x+x×\frac{1}{3}×\frac{9}{2}+x×\frac{7}{2}=252\)
\(x\left(1+\frac{1}{3}×\frac{9}{2}+\frac{7}{2}\right)=252\)
\(x×\frac{36}{6}=252\)
\(x×6=252\)
\(x=252:6\)
\(x=43\)
=>y+y x 1/3x9/2+yx7/2=252
=>y+yx3/2+yx7/2=252
=>y x (3/2+7/2+1)=252
=> y x 6=252
=> y = 252:6=42
\(x+x\times3:\frac{2}{9}+x:\frac{2}{7}=252\)
\(x+x\times\left(3:\frac{2}{9}\right)+x\times\frac{7}{2}=252\)
\(x+x\times\frac{27}{2}+x\times\frac{7}{2}=252\)
\(x\times\left(1+\frac{27}{2}+\frac{7}{2}\right)=252\)
\(x\times18=252\)
\(x=14\)
\(\Leftrightarrow x+1,5x+3,5x=252\)
<=>6x=252
<=>x=42
ủng hộ nhe
\(\frac{x+x.1}{3}:\frac{2}{9}+\frac{2}{7}=252\)
\(\Rightarrow\frac{2x}{3}:\frac{2}{9}+\frac{2}{7}=252\)
\(\Rightarrow\frac{2x}{3}:\frac{2}{9}=\frac{1762}{7}\)
\(\Rightarrow\frac{2x}{3}=\frac{3524}{63}\)
\(\Rightarrow2x=\frac{3524}{21}\)
\(\Rightarrow x=\frac{1762}{21}\)
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