125*y-12*y-13*y=5.208.000

 (125-12-13)*y=5208000

100*y=5208000

y=5208000:100

y=52080

125 \(\times\) y - 12 \(\times\)y - 13 \(\times\) y = 5208000

y \(\times\)( 125 - 12 - 13) = 5208000

y \(\times\) 100 = 52008000

y = 5208000 : 100

y = 52080

125 \(\times\) y - 12 \(\times\) y - 13 \(\times\) y = 5208000

y \(\times\) ( 125 - 12 - 13) = 5208000

y \(\times\) 100 = 5 208 000

y = 5 208 000 : 100

y = 52 080 

125.y-12.y-13.y=5208000

(125-12-13).y=5208000

100.y=5208000

y=5208000:100

y=52080

125 x y - 12 x y - 13 x y = 5208000

y x (125 - 12 - 13) = 5208000

y x 100 = 5208000

y = 5208000 : 100

y = 52080

vậy ...

`125×y−12×y−13×y=520800`

`(125−12−13)×y=520800`

`100×y=520800`

`y=520800:100`

`y=5208`

Vậy` y=5208`

y thỏa mãn(2y+1)^3=-125

thì y=-3

Tại sao lại là 3 ???

a) => y+42+2y= -12-14+2y

y+2y-2y = -12-14-42

y= -68

b) => 15+y-5-5y= -12-5y

y-5y+5y= -12-15+5

y = -22

c) => 2y+5-8y+21= -3-5y-2

2y-8y+5y= -3-2-5-21

-y= -31=>y=31

d)=> -13+3y+23= -120+y

3y-y= -120+13-23

2y= -130=>y= -65

e) => -21+32+5y= 16+4y

5y-4y= 16+21-32

y= 5

bài 1

a)y-(-42-2y) = (-12) - 14 +2y

y +42 + 2y = -12 -14 +2y

3y + 42 = -26 +2y

y = -68

b)15-(-y+5)-5y=-(12+5y+2)

15+y-5-5y=-12-5y-2

10-4y=-14-5y

-4y+5y=-14-10=-24

c)2y-(-5+8y-21)=-3-(5y+2)

2y+5-8y+21=-3y-5y-2

-6y+26=-8y-2

-6y+8y=-2-26

2y=-28

y=-28/2=-14

A

Chọn A

a) -(-27-y)=18-(-7)

27+y=18+7

27+y=25

y=25-17

y=-2

b) -(-y-28)-(-11+5)=(-13)-28

y+28+11-5=-41

y+39=-41+5

y=-36-39

y=-75

c) y-(25+37)-(13+26)=-(-42)-142

y-62-39=42-142

y-101=-100

y=-100+101

y=1

d) -(-315-y)-(-122)=-(-25-125)

315+y+122=25+125

437+y=150

y=150-437

y=-287

a, -(-27-y)=18-(-7)=27-y=18+7=27-y=25 suy ra y=27-25=2

\(a,-\left(-27-y\right)=18-\left(-7\right)\)

\(\Rightarrow27+y=18+7\)

\(\Rightarrow27-18-7=-y\)

\(\Rightarrow y=-1\)

13y+5y-12y=1200

6y=1200

=>  y x (13+5-12) =1200

=>y x 6 =1200

=>y = 1200: 6

=> y= 200

=>  y(13+5-12) =1200

=>y6 =1200

=>y = 1200: 6

=> y= 200