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\(\dfrac{x}{17}+\dfrac{19}{34}=2\dfrac{1}{2}\)
\(\Rightarrow\dfrac{x}{17}+\dfrac{19}{24}=\dfrac{5}{2}\)
\(\Rightarrow\dfrac{x}{17}=\dfrac{33}{17}\Rightarrow x=33\)
x/17 + 19/34 = 2 1/2
x/17 + 19/34 = 5/2
x/17 = 5/2 - 19/34
x/17 = 33/17
Vậy x = 33
x/17 + 19/34 =2 1/2
x/17 + 19/34 =5/2
x/17 = 5/2 - 19/34
x/17 = 33/17
Vậy x = 17
\(\left(\frac{2}{11\times13}+\frac{2}{13\times15}+\frac{2}{15\times17}+\frac{2}{17\times19}+\frac{2}{19\times21}\right)\times462-x=19\)
\(\left(\frac{1}{11}-\frac{1}{13}+\frac{1}{13}-\frac{1}{15}+...+\frac{1}{19}-\frac{1}{21}\right)\times462-x=19\)
\(\left(\frac{1}{11}-\frac{1}{21}\right)\times462-x=19\)
\(\frac{10}{231}\times462-x=19\)
\(20-x=19\)
\(\Rightarrow x=20-19=1\)
\(\frac{x}{17}+\frac{19}{34}=2\frac{1}{2}\)
\(\Rightarrow\frac{2x}{34}+\frac{19}{34}=2\frac{1}{2}\)
\(\Rightarrow\frac{2x+19}{34}=2\frac{1}{2}\Rightarrow2x+19=34.2\frac{1}{2}\Rightarrow2x+19=85\Rightarrow2x=66\Rightarrow x=33\)
b) 30% * x + x =52
=> 3/10 * x + x=52
=> x * ( 3/10 + 1 ) = 52
=> x *1,3 = 52
=> x = 52 : 1,3 =40
\(\frac{x}{17}+\frac{19}{34}=2\frac{1}{2}=\frac{5}{2}\)
\(\frac{x}{17}=\frac{5}{2}-\frac{19}{34}\)
\(\frac{x}{17}=\frac{170}{68}-\frac{38}{68}\)
\(\frac{x}{17}=\frac{132}{68}\)
=>\(x.68=17.132\)
\(x.68=2244\)
\(x=2244:68\)
\(x=33\)
vậy x=33
dấu"." chính là phép nhân đó em!!!
chúc em học giỏi...
x/13 + 19/34 = 5/2
x/13 = 5/2 - 19/34
x/13 = 33/17
x = 33/17 : 13 ?
x = 33/221 ?