a) y=1,8:0,75=2,4
b) y=0,483:0,15=3,22
c) y=2,7+(3,48:1,45)=5,1
d) y=(0,125+0,5):0,25=0,7

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=1,25x3,14=3,925

b: =>y:0,24=15-7,8=7,2

hay y=1,728

c: =>10y=36,7

hay y=3,67

d: =>6:y=1,5

hay y=4

e: =>4y+0,2y=44,1

=>4,2y=44,1

hay y=10,5

a) \(2,5:4x=0,5:0,2\)

\(2,5:4x=\frac{5}{2}\)

\(4x=2,5:\frac{5}{2}\)

\(4x=1\)

\(x=\frac{1}{4}\)

Vậy \(x=\frac{1}{4}\)

b) \(\frac{1}{5}.x:3=\frac{2}{3}:0,25\)

\(\frac{1}{5}.x:3=\frac{8}{3}\)

\(\frac{1}{5}.x=\frac{8}{3}.3\)

\(\frac{1}{5}.x=8\)

\(x=8:\frac{1}{5}\)

\(x=40\)

Vậy \(x=40\)

a) \(\frac{2,5}{4x}=\frac{0,5}{0,2}\)

\(=>4x=\frac{0,2.2,5}{0,5}=1\)

\(=>x=\frac{1}{4}\)

b) \(\frac{1}{5}.\frac{x}{3}=\frac{2}{3}:0,25\)

\(=>\frac{x}{15}=\frac{4}{3}\)

\(=>x=\frac{4.15}{3}=20\)

a) y x 8 + y +25% = 36,34 

y x (8+1) + 0,25 = 36,34

y x 9 = 36,34 - 0,25

y x 9 = 36,09

y        = 36,09 : 9 

y        = 4,01

b) y + y :0,5 + y:0,25 + y:0,125 = 15

y + y x 2 + y x 4 + y x 8 =15

y x (1+2+4+8)=15

y x 15 =15

y=15: 15

y=1

0,25 x y = 0,125 + 0,5

0,25 x y = 0,625

y = 0,625 : 0,25 

y = 0,25

vậy x  = ...

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

a: \(y\cdot2,8+y\cdot5,2=48\)

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

=>\(8y=48\)

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

b: \(y\cdot12,25-y+y\cdot2,75=1050\)

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

=>\(y\cdot14=1050\)

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

\(a,y\times27+y\times30+y\times44-y=10500\\\Rightarrow y\times\left(27+30+44-1\right)=10500\\ \Rightarrow y\times100=10500\\ \Rightarrow y=10500:100\\ \Rightarrow y=105\\ b,y\times285+115\times y=400\\ \Rightarrow y\times\left(285+115\right)=40\\ \Rightarrow y\times400=400\\ y=400:400\\ \Rightarrow y=1\)

\(a,\Rightarrow y\times\left(27+30+44-1\right)=10500\\ \Rightarrow y\times100=10500\\ \Rightarrow y=105\\ b,\Rightarrow y\times\left(285+115\right)=400\\ \Rightarrow y\times400=400\\ \Rightarrow y=1\)