\(486:y-126:y=6\)

\(\Leftrightarrow\left(486-126\right):y=6\)

\(\Leftrightarrow360:y=6\)

\(\Leftrightarrow y=360:6\)

\(\Leftrightarrow y=60\)

Đáp số : 60

486 : y - 126 : y = 6

( 486 - 126 ) : y = 6

       360       : y = 6

                     y =     360 : 6

                     y = 60  

:D

\(486:y-126:y=6\)

\(\left(486-126\right):y=6\)

\(y=60\)

486 : y - 126 : y = 6

( 486 - 126 ) : y = 6

360 : y = 6

=> y = 360 : 6

y= 60

b, y x 70 = 42000 : 60

y x 70 = 700

y = 700 : 70

y = 10

a) 

\(486:y-126:y=6\)

\(\left(486-126\right):y=6\)

\(360:y=6\)

\(y=360:6\)

Vậy \(y=60\)

b)

\(y\times70=42000:60\)

\(y=\frac{42000:60}{70}\)

Vậy \(y=10\)

nha

a , 486 : y - 126 : y = 6 

     ( 486 - 126 ) : y = 6

       360 : y = 6

       y =   360 : 6 

      y =  60

b ,   y \(\times\) 70  =  42000 :  60 

            y \(\times\)  70  =  700

         y =     700 : 70 = 10

\(\frac{x}{2}=\frac{y}{4}\Rightarrow\frac{x}{10}=\frac{y}{20}\) (*)

\(\frac{y}{5}=\frac{z}{6}\Rightarrow\frac{y}{20}=\frac{z}{24}\)(**)

Từ (*) và (**) \(\Rightarrow\frac{x}{10}=\frac{y}{20}=\frac{z}{24}=k\)\(\Rightarrow x=10k\); \(y=20k\); \(z=24k\)

Ta có : \(x+y+z=486\Rightarrow10k+20k+24k=486\Rightarrow54k=486\Rightarrow k=\frac{486}{54}=9\)

Do đó : \(\frac{x}{10}=9\Rightarrow x=9.10=90\)

             \(\frac{y}{20}=9\Rightarrow y=9.20=180\)

           \(\frac{z}{24}=9\Rightarrow z=9.24=216\)

Vậy .....

\(\frac{x}{2}\)= \(\frac{y}{4}\); \(\frac{y}{5}\)= \(\frac{z}{6}\) và x+y+z=486

\(\Rightarrow\)\(\frac{x}{10}\)= \(\frac{y}{20}\); \(\frac{y}{20}\)= \(\frac{z}{24}\)

\(\Rightarrow\)\(\frac{x}{10}\)= \(\frac{y}{20}\)= \(\frac{z}{24}\)và x+y+z=486

Áp dụng tính chất dãy tỉ số bằng nhau ta có:

\(\frac{x}{10}\)= \(\frac{y}{20}\)= \(\frac{z}{24}\)=\(\frac{x+y+Z}{10+20+24}\)= \(\frac{486}{54}\)= 9

Suy ra:       \(\frac{x}{10}\)= 9\(\Rightarrow\)x= 9.10=90

                 \(\frac{y}{20}\)= 9\(\Rightarrow\)y= 20.9= 180

                  \(\frac{z}{24}\)= 9\(\Rightarrow\)z= 24.9= 216

Vậy x= 90; y=180; z= 216

Tìm x : 486 : x – 126 : x = 6 

x = 81

x = 21

x = 60

x = 2160

\(x=60\)

x = 60

486 : x - 126 : x = 6

x : ( 486 - 126 ) = 6

x : 360 = 6

x = 360 : 6

= x = 60

HT

x=60 nha bạn

( 486 - 126 ) : x = 6

 360 : x = 6

           x = 360 : 6

           x = 60

:)))

Cảm ơn bạn nhiều

a,486:x-126:x=6

=>(486-126):x=6

=>360:x=6

=>x=360:6

=>x=60

b,725:x+175:x=5

=>(725+175):x=5

=>900:x=5

=>x=900:5

=>x=180

486:x-126:x=6

(486-126):x=6

360:x=6

x=360:6

x=60

725:x+175:x=5

(725+175):x=5

900:x=5

x=900:5

x=180

426 : x - 126 : x = 6

( 486 - 126 ) : x = 6

360 : x = 6

x = 360 : 6

x = 60

725 : x + 175 : x = 5

( 725 + 175 ) : x = 5

900 : x = 5

x = 900 : 5

x = 180

y + 126 = 480 x 12

y + 126 = 5760

y = 5760 - 126

y = 5634

Các bạn ủng hộ cho mik nha !!!

y+126=480*12

y+126=5760

y=5760-126

y=5634