720:(yx2+yx3)=2x3

720:(yx2+yx3)=6

(yx2+yx3)=720:6

yx2+yx3=120

yx(2+3)=120

yx5=120

y=120:5

y=24

nhé bạn

MK đầu tiên

nhanh nhất

yx2+50+yx3=100

yx(2+3)+50=100

yx5=100-50

yx5=50

y=50:5

y=10

                X-Yx3=Yx3+4,25

                X-Yx3-Yx3=4,25

                X-Yx(3-3)=4,25

                X-Yx0=4,25

            => X=4,25

           4,25-Y=2,25

                  Y=4,25-2,25

                  Y=2

Bai nay sao de vay?

x=y+2.25

<=> y+2.25 - 3y=3y+4.25

<=>  5y=-2

y=-0.4

x=1.85         bai nay ra am nha

\(118,24-\left(y\cdot3+y:5\right)=54,24\)

=>\(\left(y\cdot3+y\cdot0,2\right)=118,24-54,24\)

=>\(y\cdot3,2=64\)

=>\(y=\dfrac{64}{3,2}=20\)

y × 2/3 - 2/3 = 9/12

y × 2/3 = 9/12 + 2/3

y × 2/3 = 9/12 + 8/12

y × 2/3 = 17/12

y = 17/12 : 2/3

y = 17/8

\(\dfrac{2}{3}\left(y-1\right)=\dfrac{9}{12}\)

\(y-1=\dfrac{3}{4}:\dfrac{2}{3}\)

\(y-1=\dfrac{9}{8}\)

\(y=\dfrac{9}{8}+1\)

\(y=\dfrac{17}{8}\)

 y x (4+6+8+2)= 200

 y x 20            =200

y = 200 : 20 

y= 10

219,1 + y:y < y \(\times\) 2 + y \(\times\) 4 - y < 230,2 - y + y

219,1 + 1  < y \(\times\) 2 + y \(\times\) 4 - y \(\times\) 1 < 230,2 - ( y - y)

210,1        < y \(\times\) ( 2 + 4  - 1) < 230,2

210,1        < y \(\times\) 5 <   230,2

210,1 : 5 < y  < 230,2: 5

     42,02  < y <  46,04