a) \(y+0,25=\frac{18}{5}+\frac{43}{4}\)

\(y+0,25=3,6+10,75\)

\(y=14,35-0,25\)

\(y=14,1\)

vậy \(y=14,1\)

b) \(\frac{83}{5}-y=20,65-\frac{376}{25}\)

\(16,6-y=20,65-15,04\)

\(y=16,6-5,61\)

\(y=10,99\)

vậy \(y=10,99\)

học tốt Nguyễn Anh Thư

x+0,25=3,6+10,75

x+0,25=14,35

x+0,25=14,35-0,25

x+0,25=14,1

x        =14,1-0,25

x=13,85

ta có
x + 0,25 = 43/4 - 18/5
=> x + 1/4 = 143/20
=> x = 143/20 - 1/4
=> x = 25/4
vậy x = 25/4

`x+0,25=18/5+43/4`

`x+0,25=3,6+10,75`

`x=3,6+10,5`

`x=14,1`

Vậy `x=14,1`

   `x+0,25=18/5+43/4`

`⇔x+1/4=18/5+43/4`

`⇔ x-18/5=43/4-1/4`

`⇔ x-18/5=42/4=21/2`

`⇔ x-36/10=105/10`

`⇔ x=141/10`

x+0,25  =\(\frac{18}{5}+\frac{43}{4}\)

\(x+\frac{1}{4}-\frac{18}{5}-\frac{43}{4}=0\)

\(\frac{20x+5-72-215}{20}=0\)

20x-282          =0

   x=   \(\frac{282}{20}\)

x=  \(\frac{141}{10}\)

Vậy x=141/10

(158 -x) : 7 = 20

158 -x = 140

x= 18

1,25 * 4 -x = 25

5-x = 25

x= 30

x-0,25 = 43/4 + 18/5

x= 43/4 + 1/4 + 18/5

x= 11 + 18/5

x= 73/5

a.

\(1,25\times4-x=2,5\)

\(5-x=2,5\)

\(x=5-2,5\)

\(x=2,5\)

b.

\(\left(158-x\right)\div7=20\)

\(158-x=20\times7\)

\(158-x=140\)

\(x=158-140\)

\(x=18\)

c.

\(x-0,25=\frac{43}{4}-\frac{18}{5}\)

\(x-\frac{1}{4}=\frac{43}{4}-\frac{18}{5}\)

\(x=\frac{43}{4}-\frac{18}{5}+\frac{1}{4}\)

\(x=\left(\frac{43}{4}+\frac{1}{4}\right)-\frac{18}{5}\)

\(x=\frac{44}{4}-\frac{18}{5}\)

\(x=11-\frac{18}{5}\)

\(x=\frac{37}{5}\)

a. 1,25 × 4 - x = 2,5

5- x= 2,5

x= 5-2,5

x=2,5

b.(158- x) :7= 20

158- x= 20x7

158 -x= 140

x=158- 140

x=18

c. x- 0,25= \(\frac{43}{4}+\frac{18}{5}\)

x- 0,25=14,35

x= 14,35+ 0,25

x=14,6

\(x\) + \(x\): 0,25 + \(x\) : 0,5 + \(x\) : 0,125 = 40

\(x\) \(\times\) 1+ \(x\) \(\times\) 4 + \(x\) \(\times\) 2 + \(x\times\) 8 = 40

\(x\) \(\times\) ( 1 + 4 + 2 + 8) = 40

\(x\) \(\times\) 15 = 40

\(x\)          = 40 : 15

\(x\)          = \(\dfrac{8}{3}\)