GIÚP MÌNH NHANH NHÉ!!!

Xx12=12000

     X=12000:12

     X=1000

X:50=1000

    X=1000:50

    X=20

Xx30=40+20

Xx30=60

     X=60:30

      X=2

X:20=40+40

X:20=80

    X=80x20

    X=1600

x=100

x=20

x=2

x=1600

x + 20 = 40 - 20

x = 40 - 20 - 20

x = 0

x + 20 = 40 - 20

x + 20 = 20

x = 20 - 20

x = 0

ai tk mk mk tk lại

\(X\times20o/o+X=7,2\)

\(\Leftrightarrow\)2x+0,2=7,2

\(\Leftrightarrow\)2x     =7,2-0,2

\(\Leftrightarrow\)2x     = 7

\(\Rightarrow\) x        =7:2

\(\Rightarrow\)x        =3,5

\(40o/o\times X+X\times20o/o=72\)

\(\Leftrightarrow0,4\times X+X\times0,2=72\)

\(\Leftrightarrow X\times\left(0,4+0,2\right)=72\)

\(\Leftrightarrow X\times0,6=72\)

\(\Rightarrow X=72:0,6\)

\(\Rightarrow X=120\)

40%*x+x*20%=72

-> 0,4x+ 0,2 x= 72

-> 0,6 x= 72

-> x=120

60×20×30×40+500

120×30×40+500

3600×40+500

144000+500

144500

Trả lời 

\(20\times30\times20\times30\times40+500\)

\(=600\times600\times40+500\)

\(=360000\times40+500\)

\(=14400000+500\)

\(=14400500\)

x + 20% * x = 7.2

x +1/5 * x = 7.2

x * ( 1 + 1/5 ) = 7.2

x * 1.2 = 7.2

x = 7.2 : 1.2

x = 6

40% * x + x * 20% = 72

2/5 * x + x * 1/5 = 72

( 2/5 + 1/5 ) * x = 72

0.6 * x = 72

x = 72 : 0.6

x = 120

Kết bạn nhé !

x + 10 = 20

x        = 20 - 10 

x       =    10

x - 20 = 30

x        = 30 + 20

x        =    50

x . 20 = 40

x        = 40 : 20

x        = 2

x : 30 = 60 

x        =  60 x 30

x        =    180

X + 10 = 20                 

       X = 20 - 10=10

X . 20 = 40

     40 : 20 = 2

X : 30 = 60

     X   = 60 . 30 = 1800