Tìm x biết 

(-3/4)^3x -1= 256/81

(5x+1) ^2 =36/49

(X-2/9)^3= (2/6)^6

(8x -1)^2n+1 = 5^2n +1

Làm tính nhân: a. \(\left(3x^{2m-1}-\dfrac{3}{7}y^{3n-5}+x^{2m}y^{3m}-3y^2\right)8x^{3-2m}y^{6-3n}\)

b.\(\left(2x^{2n}+3x^{2n-1}\right)\left(x^{1-2n}-3x^{2-2n}\right)\)

Bài 1: Thực hiện phép tính:

A = \(\left(2x^{2n}+3x^{2n-1}\right)\left(x^{1-2n}-3x^{2-2n}\right)\)

B = \(\left(3x^{2m-1}-\frac{3}{7}y^{3n-5}+x^{2m}y^{3n}-3y^2\right).8x^{3-2m}y^{6-3n}\)

Tìm x, biết:

a) ( 5x+1)^2+36/49

b) (x-2/9)^3=(2/3)^6

c) (8x-1)^2n+1=5^2n+1

TÌM X ∈ N BIẾT :

1)    6⋮(N+2)

2)    11⋮(2N-1)

3)    13⋮(N-1)

4)    23⋮(2N-1)

5)    24⋮(N+3)

6)   (N+7)⋮(N+2)

7)   (2N+8)⋮(2N+1)

8)   (2N+9)⋮(2N-1)

9)   (3N+7)⋮(N+1)

10)  (2N+10)⋮(N+2)
 

(5x+1)² = 36/49

(x-2/9)³ = (2/3)⁶

⁽8x-1)²ⁿ⁺¹= 5²ⁿ⁺¹

(5x+1)²=36/49

(3x-2)⁵=-243

5^x=125

(3x²-51)²ⁿ=(-24)²ⁿ (n thuoc N*)

 Câu 1:(x²-1).(x²+2x), câu 2: (2x-1)(3x+2).(3-x) câu 4: -2x³y(2x³-3y+5yz) câu 5 (3xⁿ⁺¹-2xⁿ).4x câu 6 (2x²ⁿ+3x^2n-1).(x^1-2n- 3x^2-2n) câu 7 : 3x.(x²-2)

\( \left(8x-1\right)^{2n-1}:5=5^{2n}\)

\(\left(x-\dfrac{2}{9}\right)^3=\left(\dfrac{2}{3}\right)^6\)

\(\text{đề bài là tìm x nhá mn}\)