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y*2+y*3+4*y+y=800*3
y * ( 2 + 3 + 4 + 1 ) = 800 * 3
y * 10 = 2400
y = 2400 : 10
y = 240
a) y × 2/5 + y × 3/5 = 5/7
y x ( 2/5 + 3/5) = 5/7
y x 5/5 = 5/7
y x 1 = 5/7
y = 5/7 : 1
y = 5/7
b) y × 7/2 - y × 3/2 = 3/4
y x ( 7/2 - 3/2) = 3/4
y x 4/2 = 3/4
y x 2 = 3/4
y = 3/4 : 2
y = 3/4 x 1/2
y = 3/8
`a,yxx(2/5+3/5)=5/7`
`y xx1=5/7`
`y=5/7:1`
`y=5/7`
`b,y xx(7/2-3/2)=3/4`
`y xx2=3/4`
`y =3/4:2`
`y=3/2`
\(\Leftrightarrow y\times\left(\dfrac{1}{7}+\dfrac{9}{21}+\dfrac{7}{3}\right)=\dfrac{5}{3}\)
\(\Leftrightarrow y\times\dfrac{61}{21}=\dfrac{5}{3}\)
\(\Leftrightarrow y=\dfrac{5}{3}:\dfrac{61}{21}=\dfrac{35}{61}\)
y x (1/7 +9/21 +7/3)= 5/3
y x 61/21 = 5/3
y = 5/3 : 61/21
y= 35/61
y - \(\dfrac{2}{3}\) = \(\dfrac{3}{10}\) y + \(\dfrac{3}{4}\) = \(\dfrac{10}{3}\)
y = \(\dfrac{3}{10}\) + \(\dfrac{2}{3}\) y = \(\dfrac{10}{3}\) - \(\dfrac{3}{4}\)
y = \(\dfrac{29}{30}\) y = \(\dfrac{31}{12}\)
`y xx 1/2 + y xx 2/3 + y = 11/5`
`<=> y xx (1/2 + 2/3 +1)=11/5`
`<=> y xx 11/6 = 11/5`
`<=> y = 6/5`.
Vậy `y = 6/5`
\(\dfrac{2\cdot3\cdot8}{4\cdot5\cdot6\cdot7}=\dfrac{1}{2}\cdot\dfrac{1}{2}\cdot\dfrac{8}{35}=\dfrac{2}{35}\)
y:3=3198
y =3198x3
y =9594
( y : 3 ) x 8 = 8 x 3198
( y : 3 ) x 8 = 25584
y : 3 = 25584 : 8
y : 3 = 3198
y = 3198 x 3
y = 9594