\(3N=3+3^2+3^3+.......+3^{11}\)

\(3N-N=\left(3+3^2+3^3+........3^{11}\right)-\left(3^0+3^1+3^3.......+3^{10}\right)\)

\(2N=1-3^{11}\)

\(N=\frac{1-3^{11}}{2}\)

\(8-12x+6x^2-x^3\)

\(=\left(2-x\right)^3\)

\(125x^3-75x^2+15x-1\)

\(=\left(5x-1\right)^3\)

\(x^2-xz-9y^2+3yz\)

\(=\left(x-3y\right)\left(x+3y\right)-z\left(x-3y\right)\)

\(=\left(x-3y\right)\left(x+3y-z\right)\)

\(x^3-x^2-5x+125\)

\(=\left(x+5\right)\left(x^2-5x+25\right)-x\left(x+5\right)\)

\(=\left(x+5\right)\left(x^2-5x+25-x\right)\)

\(=\left(x+5\right)\left(x^2-6x+25\right)\)

\(x^3+2x^2-6x-27\)

\(=x^3+5x^2+9x-3x^2-15x-27\)

\(=x\left(x^2+5x+9\right)-3\left(x^2+5x+9\right)\)

\(=\left(x-3\right)\left(x^2+5x+9\right)\)

\(12x^3+4x^2-27x-9\)

\(=4x^2\left(3x+1\right)-9\left(3x+1\right)\)

\(=\left(3x+1\right)\left(4x^2-9\right)\)

\(=\left(3x+1\right)\left(2x-3\right)\left(2x+3\right)\)

\(4x^4+4x^3-x^2-x\)

\(=4x^3\left(x+1\right)-x\left(x+1\right)\)

\(=x\left(x+1\right)\left(4x^2-1\right)\)

\(=x\left(x+1\right)\left(2x-1\right)\left(2x+1\right)\)

Là 00000000000000

B = 20 + 31 + 33 + 12144

B = 12228

B=20+31+33+24.22.23

B=20+31+33+528.23

B=20+31+33+12144

B=51+33+12144

B=84+12144

B=12228

Vậy B=12228

a) 25.76+24.35 + \(5^3.2^3\)=x

25.76+24.35+ 125. 8=x

1900+ 840+1000=x

2740+840+1000=x

3580+1000=x

4580=x. Vậy x= 4580

b) 4x-166=\(3^3:3^2\)

4x-166=3

4x= 166+3

4x= 169

x= 169: 4

x= 42,25

c) x-4.\(5^2+3^2:2^4\)= 0

x- 4.25+ 9: 16=0

x- 100+0,5625=0

x - 100,5625=0

x=0+100,5625

x= 100,5625

d) 4x - 158 = \(2^3.3^2\)-50

4x-158= 8.9-50

4x-158= 72-50

4x-158= 22

4x= 158+22

4x=180

x= 180:4

x= 45

bài 1 mifk viết sai nha.

bài 1: cho A=1+3+3\(^2\)+3\(^3\)+...+3\(^{10}\).Tìm số tự nhiên n biết 2 x A + 1 = 3\(^n\)

B1:

\(A=1+3+3^2+3^3+...+3^{10}\\ 3A=3+3^2+3^3+3^4+...+3^{11}\\ 3A-A=3^{11}-1\\ \Rightarrow A=\frac{3^{11}-1}{2}\)

mấy câu khác tương tự nha

cái câu a) kiểu j đấy

Bài 1

a, 2³ + ( x - 3² ) = 1

x - 3² = 1 - 2³ = -7

x = -7 + 3²

x = 2

b, 5 . (x+7) -10 = 40

5 . (x+7) = 50

x+7 = 50 :5 =10

x = 10 - 7

x = 3