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\(\dfrac{y}{2}+\dfrac{y+y}{3}+\dfrac{y+y+y}{4}=\dfrac{13}{12}\)
\(\dfrac{1}{2}y+\dfrac{2}{3}y+\dfrac{3}{4}y=\dfrac{13}{12}\)
\(y\left(\dfrac{1}{2}+\dfrac{2}{3}+\dfrac{3}{4}\right)=\dfrac{13}{12}\)
\(\dfrac{23}{12}y=\dfrac{13}{12}\)
\(y=\dfrac{13}{12}\div\dfrac{23}{12}=\dfrac{13}{23}\)
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\(y+y.\frac{1}{3}.\frac{9}{2}+y.\frac{7}{2}=25\)
\(y+y.6+y.\frac{7}{2}=25\)
\(y.\left(1+6+\frac{7}{2}\right)=25\)
\(y.\frac{21}{2}=25\)
\(y=25:\frac{21}{2}\)
\(y=25.\frac{2}{21}\)
\(y=\frac{50}{21}\)
\(y.5+y.3+y+y=50\)
\(y.\left(5+3+1+1\right)=50\)
\(y.10=50\)
\(y=5\)
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y : ( 2 + 1 + 3 + 4) = 25
y : 10 = 25
y = 25 x 10
y = 250
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\(\text{y : 2 + y + y : 3 + y : 4 = 25}\)
\(\text{1/2 .y + y + 1/3 . y + 1/4 . y = 25}\)
\(\text{y . (1/2 + 1/3 + 1/4 + 1) = 25}\)
\(\text{y . 25/12 = 25}\)
\(\text{y = 25 : 25/12 = 25 . 12/25}\)
\(\text{y = 12 }\)
Vậy \(y=12\)
\(y:2+y+y:3+y:4=25\\ y:\left(2+3+1+4\right)=25\\ y:10=25\\ y=25x10\\ y=250.\)
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( y+1) + ( y+2) + (y+3) + ( y+4)+...+( y+100) = 5750
=>( 100 x y )+ ( 1+2+3+4+ ...+ 100) = 5750
100 x y +[ (1+100) .100 : 2 ]= 5750
100 x y + 5050 = 5750
100 x y = 5750 - 5050
100 x y = 700
y = 700 : 100
y = 7
(y+1) +(y+2) + (y+3) + ( y+4) + ...+ (y+100)= 5750
............................
y=7
Hk tốt
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\(\left(y+1\right)+\left(y+2\right)+\left(y+3\right)+\left(y+4\right)+...+\left(y+37\right)=999\)
\(y+y+y+y+...+y+1+2+3+4+...+37=999\) ( 37 số y )
Phần 1 + 2 + 3 + 4 + ... + 37 có : ( 37 - 1 ) / 1 + 1 = 37 ( số hạng )
\(\Rightarrow37y+\frac{\left(37+1\right)37}{2}=999\)
\(37y+703=999\)
\(37y=999-703\)
\(37y=296\)
\(y=\frac{296}{37}=8\)
\(y× (3+4+2+1)=9,84\)
\(y× 10=9,84\)
\(y=9,84:10\)
\(y=0,984\)