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y × 2/3 - 2/3 = 9/12
y × 2/3 = 9/12 + 2/3
y × 2/3 = 9/12 + 8/12
y × 2/3 = 17/12
y = 17/12 : 2/3
y = 17/8
\(\dfrac{2}{3}\left(y-1\right)=\dfrac{9}{12}\)
\(y-1=\dfrac{3}{4}:\dfrac{2}{3}\)
\(y-1=\dfrac{9}{8}\)
\(y=\dfrac{9}{8}+1\)
\(y=\dfrac{17}{8}\)
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219,1 + y:y < y \(\times\) 2 + y \(\times\) 4 - y < 230,2 - y + y
219,1 + 1 < y \(\times\) 2 + y \(\times\) 4 - y \(\times\) 1 < 230,2 - ( y - y)
210,1 < y \(\times\) ( 2 + 4 - 1) < 230,2
210,1 < y \(\times\) 5 < 230,2
210,1 : 5 < y < 230,2: 5
42,02 < y < 46,04
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Y x 1 + Y x 2 + Y x 3 + ... + Y x 100 = 12625
Y x (1+2+3+...+100) = 12625
Y x (100+1) x (100:2) = 12625
Y x (101 x 50) = 12625
Y x 5050 = 12625
Y= 12625 : 5050
Y= 2,5
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720:(yx2+yx3)=2x3
720:(yx2+yx3)=6
(yx2+yx3)=720:6
yx2+yx3=120
yx(2+3)=120
yx5=120
y=120:5
y=24
nhé bạn
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