\(\frac{x}{27}-\frac{2}{9}=\frac{6}{18}\)

\(\Rightarrow\frac{x}{27}=\frac{6}{18}+\frac{2}{9}\)

   \(\frac{x}{27}=\frac{5}{9}\)

    \(\frac{x}{27}=\frac{15}{27}\)

      \(\Rightarrow x=15\)

Vậy x=15

Học tốt

HAPPY NEW YEAR!!!!!!!!!!!

\(\frac{x}{27}-\frac{2}{9}=\frac{6}{18}\)

\(\frac{x}{27}=\frac{6}{18}+\frac{2}{9}\)

\(\frac{x}{27}=\frac{6}{18}+\frac{4}{18}\)

\(\frac{x}{27}=\frac{10}{18}=\frac{5}{9}\)

\(x=\frac{5}{9}\times27\)

\(x=15\)

Công Chúa Cầu Vồng

 Kết bạn

Ta có :

x/27-2/9=6/18

=> x/27=6/18+2/9

=> x/27=(6+4)/18

=> x/27=10/18

=> x=(27x10)/18

=> x=270/18

=> x=15

\(\frac{1.5.18+2.10.36+3.15.54}{1.3.9+2.6.18+3.9.27}=\frac{1.5.18.\left(1+2.2.2+3.3.3\right)}{1.3.9.\left(1+2.2.2+3.3.3\right)}\)

\(=\frac{1.5.18}{1.3.9}=\frac{10}{3}\)

9 + 18 + 27 + 36 + 45 + 54 + 63 + 72 + 90 = 414

kết quả là :

   414 

      đs...

1 x 9 = 9

2 x 9 = 18

3 x 9 = 27

4 x 9 = 36

5 x 9 = 45

6 x 9 = 54

7 x 9 = 63 

8 x 9 =72

9 x 9 = 81

10 x 9 = 90

Câu hỏi là : 9 + 18 + 27 + 36 + 45 + 54 + 63 + 72 + 81 +90 =414

17 - 2x = -15

2x = 17 - (-15)

2x = 32

x = 32 : 2

x = 16

--------

54 : (x + 2) = -6

x + 2 = 54 : (-6)

x + 2 = -9

x = -9 - 2

x = -11

--------

12.(3 - x) = 72

3 - x = 72 : 12

3 - x = 6

x = 3 - 6

x = -3

-------

-3(x + 5) + 18 = -27

-3(x + 5) = -27 - 18

-3(x + 5) = -45

x + 5 = -45 : (-3)

x + 5 = 15

x = 15 - 5

x = 10

-------

(x + 5)² = 9

x + 5 = 3 hoặc x + 5 = -3

*) x + 5 = 3

x = 3 - 5

x = -2

*) x + 5 = -3

x = -3 - 5

x = -8

Vậy x = -8; x = -2

--------

(3 - x)³ = 27

(3 - x)³ = 3³

3 - x = 3

x = 3 - 3

x = 0

=00

- 3\(x\) + 24  = -24

  3\(x\)          = 24 + 24

   3\(x\)          = 48

     \(x\)           = 48 : 3

     \(x\)           = 16

\(\frac{x}{27}-\frac{2}{9}=\frac{6}{18}\)

\(\frac{x}{27}-\frac{2}{9}=\frac{1}{3}\)

\(\frac{x}{27}=\frac{1}{3}+\frac{2}{9}\)

\(\frac{x}{27}=\frac{3}{9}+\frac{2}{9}\)

\(\frac{x}{27}=\frac{5}{9}\)

\(\Rightarrow x\div27=\frac{5}{9}\)

\(\Rightarrow x=\frac{5}{9}\times27\)

\(\Rightarrow x=15\)

Dễ quá à

\(\frac{x}{27}-\frac{2}{9}=\frac{6}{18}\)

\(\frac{x}{27}=\frac{6}{18}+\frac{2}{9}\)

\(\frac{x}{27}=\frac{5}{9}\)

       \(\Rightarrow x.9=5.27\)

       \(\Rightarrow x.9=135\)

       \(\Rightarrow x=15\)

Vậy x=15

\(\frac{x}{27}-\frac{2}{9}=\frac{6}{18}\)

\(\frac{x}{27}=\frac{6}{18}+\frac{2}{9}\)

\(\frac{x}{27}=\frac{3}{9}+\frac{2}{9}\)

\(\frac{x}{27}=\frac{5}{9}\)

\(x=\frac{5}{9}\times27\)

\(x=15\)

9 x 2 = 18              9 x 3 = 27                  9 x 4 = 36                      9 x 5 = 45

18 : 9 = 2               27 : 9 = 3                  36 : 9 = 4                        45 : 9 = 5

9 x 6 = 54              9 x 7 = 63                  9 x 8 = 72                       9 x 9 = 81

54 : 9 = 6               63 : 9 = 7                   72 : 9 = 8                       81 : 9 = 9

a)11/14 - x/7 =5/19

x/7= 139/266

x= 193/38

b)x/27 -2/9 =6/18

x/27= 5/9

x=15

thanks