a, X + 20% x  X = 7,2

     X + 1/5 x X = 7,2

    X + 1/5 x X + 1 = 7,2

     X . ( 1/5 + 1 ) = 7,2

       X . 1,2 = 7,2

      X = 7,2 : 1,2

       X = 6

      Vậy X =6

Dap an ; x = 6 

      OK ? Bai minh lam giong may ban do .

a) X=6

b) X=12,3

c) X=120

d) X= 270

\(4x+\frac{1}{2}x=55,35.\)

\(\Leftrightarrow\left(4+\frac{1}{2}\right)x=55,35.\)

\(\Leftrightarrow4,5x=55,35\)

\(\Leftrightarrow x=12,3\)

hộ mình với mình đang cần gấp

\(x\cdot4+\frac{1}{2}\cdot x=55,35\)

\(x\cdot\left(4+\frac{1}{2}\right)=55,35\)

\(x\cdot\frac{9}{2}=55,35\)

\(x=12,3\)

x*4+1/2*x=55,35

=x*(4+1/2)=55,35

=x*4,5=55,35

=55,35:4,5

=12,3

123/10 hoặc 12,3

`!`

`x xx 4 +1/2 xx x=55,35`

`=> x xx ( 4+1/2) =55,35`

`=  x xx 9/2=55,35`

`=>x= 55,35 : 9/2`

`=>x= 3,075`

Bài 1: 0,01m³ < 1,99m³

Bài 2: Tìm \(x\):

\(x\)x 4 + \(\frac{1}{2}\)x \(x\)= 55,35

\(x\)x (4 + \(\frac{1}{2}\)) = 55,35

\(x\)x \(\frac{9}{2}\)= 55,35

\(x\)= 55,35 : \(\frac{9}{2}\)

\(x\)= 249,075

1,

\(0,01m^3=\frac{1}{100}m^3\); vậy  \(\frac{1}{100}m^3< \frac{1}{99}m^3\)

2, Lời giải

\(x\cdot4+\frac{1}{2}\cdot x=55,35\)

\(\Rightarrow x\cdot\left(4+\frac{1}{2}\right)=55,35\)

\(\Rightarrow x\cdot4\frac{1}{2}=55.35\)

\(\Rightarrow x\cdot4,5=55,35\)

            \(x=55,35:4,5\)

            \(x=12,3\)

thanks for answering!!!!!!!!!!!!!!!!!

\(x\times4\times x=55,35\)

\(x\times x=55,35:4\)

\(x\times x=13,8375\)

\(\Rightarrow x=3,719879....\)

ta co X x 4 +X = 55,35

X x 5 = 55,35f

X=55,35 chia 5

ban tu tinh nha

X x 4 + X = 55,35

4X+X=55,35

5X=55,35

X=11,07

X x 4 + X = 55, 35

4X + X = 55, 35

5X = 55, 35

X = 55, 35 : 5

X = 11, 07