Question

2². 3 - {1mu 10 + 8 } : 31 + 6 + 11 + ...... + 2001 + 20086 mu 2 : 4 . 3 + 2. 5 mu 24.{3x - 4 } - 2 = 18{ 105 - x } : 2⁵ = 3⁰+ 12x - 138 = 2². 3²{6x - 39 } . 28 = 5628{ 9x + 2 } . 3 = 60{ 26 - 3x } : 5 + 71 = 755^x + 1= 125cho S = 2⁰+ 2 + 2 mu 2 + 2 mu 3 + ........ + 2 ^{​23chung minh rang S chia het cho 3chung minh rang S chia het cho 7}

 

Answer 1

1,2,3 ko bt lm nhé

4. \(4\cdot\left(3x-4\right)-2=18\\ 12x-16-2-18=0\\ 12x=-36\\ x=-2\)

5. ( 105-x)/2⁵=3⁰+1

(105-x) / 32 = 1+1

( 105-x) / 32 = 2

105-x=64

x=105-64

x=41

6. 2x - 138=2²*3²

2x-138=36

2x=138+36

2x=174

x=87

7.(6x-39)*28=5628

6x-39=201

6x=240

x=40

8. (9x+2)*3=60

9x+2=20

9x=18

x=2

9. (26-3x)/5+71=75

(26-3x) /5=4

26-3x = 20

3x=6

x=2