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12x - 33 = 3².3³
12x - 33 = 9.27
12x - 33 = 243
12x = 243 + 33
12x = 276
x = 276 : 12
x = 23
\(12x-33=3^2\cdot3^3\)
\(12x-33=3^{2+3}\)
\(12x-33=3^5\)
\(12x-33=243\)
\(12x=243+33\)
\(12x=276\)
\(x=\dfrac{276}{12}\)
\(x=23\)
12x – 33 = 32.33
12x - 33 = 9.27
12x - 33 = 243
12x = 243 + 33
12x = 276
x = 276:12
x = 23
Vậy x = 23
d)12.x - 33= 3 2 . 3 3
12.x - 33 = 9.27
12.x - 33 = 243
12.x = 243 + 33
12.x = 276
x = 276:12
x = 23
\(B=1\cdot2+2\cdot3+3\cdot4+\dots+31\cdot32+32\cdot33\\3B=1\cdot2\cdot3+2\cdot3\cdot3+3\cdot4\cdot3+\dots+31\cdot32\cdot3+32\cdot33\cdot3\\=1\cdot2\cdot3+2\cdot3\cdot(4-1)+3\cdot4\cdot(5-2)+\dots+31\cdot32\cdot(33-30)+32\cdot33\cdot(34-31)\\=1\cdot2\cdot3+2\cdot3\cdot4-1\cdot2\cdot3+3\cdot4\cdot5-2\cdot3\cdot4+\dots+31\cdot32\cdot33-30\cdot31\cdot32+32\cdot33\cdot34-31\cdot32\cdot33\\=32\cdot33\cdot34\\\Rightarrow B=\dfrac{32\cdot33\cdot34}{3}=32\cdot11\cdot34\)
Vì \(32\cdot11\cdot34⋮34\)
nên \(B\vdots34\).
Ta có : B = 1.2 +2.3 +...+31.32 + 32.33
3B = 1.2.3 + 2.3.3+...+ 31.32.3 + 32.33.3
3B = 1.2.3 + 2.3.(4-1) +...+ 31.32.(33-30)+32.33.(34-31)
3B = 1.2.3 + 2.3.4 - 2.3.1 +...+ 31.32.33-30.31.32 + 32.33.34- 31.32.33
3B = 32.33.34 B = 32.33.34 / 3 = 32.11.34 chia hết cho 34
Vậy B chia hết cho 34
Ta có : S = 1.2 + 2.3 + 3.4 + ..... + 32.33
=> 3S = 1.2.3 - 1.2.3 + 2.3.4 - 2.3.4 + ...... + 32.33.34
=> 3S = 32.33.34
=> S = \(\frac{32.33.34}{3}=11968\)
12x-33=32.33
=>12x-33=9.27
=>12x-33=243
=>12x=243+33
=>12x=276
=>x=276:12
=>x=23
Vậy x=23
12x-33 = 3^2.3^3
=> 12x-33 = 3^5
=> 12x-33 = 243
=>12x = 243+33
=>12x = 276
=> x = 276:12
=> x = 23
12x - 33 = 243
12x = 243 + 33
12x = 276
x = 276: 12
x = 23
chúc bạn học tốt
12x - 33 = 32 . 33
=> 3.(4x - 11) = 35
=> 4x - 11 = 34
=> 4x = 34 + 11
=> 4x = 92
=> x = 92 : 4
=> x = 23