4 (x-3)=3
x-3=3:4
x-3=0,75
x=0,75+3
x=3,75

b, 4 ( x - 3 ) = 3

x - 3 = \(\dfrac{3}{4}\) = 0,75 

x = 0,75 + 3 = 3,75

x=3:4+3=15/4

\(\dfrac{10^3+5\cdot10^2+5^2}{6^3+3\cdot6^2+3^3}=\dfrac{5^3\cdot2^3+5\cdot2^2\cdot5^2+5^2}{2^3\cdot3^3+3\cdot2^2\cdot3^2+3^3}\\ =\dfrac{5^3\left(2^3+2^2+1\right)}{3^3\left(2^3+2^2+1\right)}=\dfrac{5^3}{3^3}=\dfrac{125}{27}\)

5/x + y/4 = 1/8 ( Đề sai )

Đề đúng :

 5/x - y/4 = 1/8

  20/x.4 - y.x/4.x = 1/8

Suy ra x . 4 = 8

x = 2

y/4 = 5/2 - 1/8= 9.5/4

1.Can I use your mobile please?

2.Could you lend me 500 please?

3.Can you tell me the time please?

4.May I borrow your umbrella please?

5.Could you turn on TV please?

6.Could you tell me the way to the bank please?

7.Can you post this letter for me please?

8.Could you give me one of these forms please?

Tick cho công người làm

4 + x = 7 - 2x

4 + x + 2x = 7

4 + 3x = 7

3x = 7 - 4

3x = 3

x = 3 : 3

x =1

5 + x = 8,3 + 4,7 - x

5 + x + x = 8,3 + 4,7

5 + 2x = 13

2x = 13 -  5

2x = 8

x = 8 : 2

x= 4

Làm đc thì mình k cho 5 cái luôn

tính máy tính là ra mà bn

a) (19.x + 2.5²): 14 = 9

    19.x +2.5²           = 9.14 =126

     19.x+ 50             =126

            19.x            =126-50 =76

                  x           = 76 :19 = 4

Câu b sao ko có đáp án tìm x vậy bn

minh lam lun nha ko ghi lai de dau

a, (19x + 2.25): 14 = 5^2 - 4^2   (25-16)

    ( 19x + 50) = 9. 14

     19x+50= 126

19x=126-50

x= 76:19

x= 4

muc b ko co kt qua lam sao ma lam

1,  Vì A, B < 1

  \(\Rightarrow B=\frac{19^{31}+5}{19^{32}+5}< \frac{19^{31}+5+90}{19^{32}+5+90}=\frac{19^{31}+95}{19^{32}+95}=\frac{19\left(19^{30}+5\right)}{19\left(19^{31}+5\right)}=\frac{19^{30}+5}{19^{31}+5}=A\)

2, Đề là thế này?? \(C=1+\frac{1}{2}\left(1+2\right)+\frac{1}{3}\left(1+2+3\right)+...+\frac{1}{200}\left(1+2+3+...+200\right)\)

\(\Rightarrow C=1+\frac{1}{2}.\frac{2.3}{2}+\frac{1}{3}.\frac{4.3}{2}+...+\frac{1}{200}.\frac{200.201}{2}\)

\(\Rightarrow C=\frac{2}{2}+\frac{3}{2}+\frac{4}{2}+...+\frac{201}{2}\)

\(\Rightarrow C=\frac{\left(2+201\right).200}{4}=10150\)

a)y=5/6

b)y=11/4

\(a\left(\frac{1}{2}-\frac{1}{4}+....+\frac{1}{8}-\frac{1}{10}\right).y=\frac{1}{3}\)
\(\left(\frac{1}{2}-\frac{1}{10}\right).y=\frac{1}{3}\)

\(\frac{2}{5}.y=\frac{1}{3}\)

      \(y=\frac{1}{3}:\frac{2}{5}\)

     \(y=\frac{5}{6}\)

\(b,\left(\frac{1}{1}-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+....+\frac{1}{9}-\frac{1}{11}\right).y=\frac{2}{3}\)

     \(\left(\frac{1}{1}-\frac{1}{11}\right).y=\frac{2}{3}\)

      \(\frac{10}{11}.y=\frac{2}{3}\)

              \(y=\frac{2}{3}:\frac{10}{11}\)

               \(y=\frac{22}{30}\)