y * 1 + y * 2 + y * 3 + y * 4 + y *1 = 825

y * ( 1 + 2 + 3 + 4  + 1) =825

y * 11 = 825

        y = 825 / 11

         y = 75   

\(y\times1+y\times2+y\times27-\left(99-22\right)=277\)

\(y\times\left(1+2+27\right)-77=277\)

\(y\times30-77=277\)

\(y\times30=277+77\)

\(y\times30=354\)

\(y=\dfrac{354}{30}\)

\(y=\dfrac{59}{5}\)

y * (2+3+4+5+6-9)=99

y * 11 =99

y = 99 : 11

y = 9

\(y\times2+y\times3+y\times4+y\times5+y\times6-y\times9=9999\)

\(y\times\left(2+3+4+5+6-9\right)=9999\)

\(y\times11=9999\)

\(y=9999:11\)

\(y=909\)

9999 mà ?

a) (y + 5) x 2020 = 205 x 2020

(y + 5) x 2020 = 414100

y + 5 = 414100 : 2020 = 205

y = 205 - 5 = 200

a) y= 200

b) y-45600 = 1600 × 4 ×25

y-45600=160000

y= 114400

b) y - 45600 = (2019 - 419) x 4 x 25

y - 45600 = 1600 x 100

y - 45600 = 160000

y = 160000 + 45600 = 205 600

\(a,y\times2,8+5,2\times y=48\\ y\times\left(2,8+5,2\right)=48\\ y\times8=48\\ y=\dfrac{48}{8}=6\\ ---\\ b,y\times12,25-y+y\times2,75=1050\\ y\times\left(12,25-1+2,75\right)=1050\\ y\times14=1050\\ y=\dfrac{1050}{14}=75\)

a: \(y\cdot2,8+y\cdot5,2=48\)

=>\(y\left(2,8+5,2\right)=48\)

=>\(8y=48\)

=>\(y=\dfrac{48}{8}=6\)

b: \(y\cdot12,25-y+y\cdot2,75=1050\)

=>\(y\left(12,25-1+2,75\right)=1050\)

=>\(y\cdot14=1050\)

=>\(y=\dfrac{1050}{14}=75\)

a: =>y=0,056:7=0,008

b: =>y=21/50:6=21/300=0,07

a, 0,008

b, 0,07

a)y=55,8 : 4,5

y=12,4

b) y=25,42 x 2,5

y= 63,55

`a)`

`yxx4,5=55,8`

`y=55,8:4,5`

`y=12,4`

`b)`

`y:2,5=25,42`

`y=25,42xx2,5`

`y=63,55`

a.y=12.4

b.y=63.55