12.(x-1) : 33 =42 + 23
tìm x
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56 - 3 ( x + 1) = 42
3( x +1) = 56 - 42
3( x + 1) = 14
x + 1 = 14/3
x = 14/3 - 1
x = 11/3
2/ 12.x - 33 = 9.27
12.x - 33 = 243
12x = 243 + 33
12x = 276
x = 276 : 12
x = 23
56 - 3 ( x + 1) = 42
3( x +1) = 56 - 42
3( x + 1) = 14
x + 1 = 14/3
x = 14/3 - 1
x = 11/3
2/ 12.x - 33 = 9.27
12.x - 33 = 243
12x = 243 + 33
12x = 276
x = 276 : 12
x = 23
Tick đúng nha
1: Ta có: \(20-2\left(x+4\right)=4\)
\(\Leftrightarrow2\left(x+4\right)=16\)
\(\Leftrightarrow x+4=8\)
hay x=4
5: Ta có: \(\left(x+1\right)^3=27\)
\(\Leftrightarrow x+1=3\)
hay x=2
\(\frac{7}{4}\)x(\(\frac{33}{12}\)+\(\frac{33}{20}\)+\(\frac{33}{30}\)+\(\frac{33}{42}\))
=\(\frac{7}{4}\)x\(\frac{44}{7}\)
=\(\frac{308}{28}\)=11
a) 80 - [130 - (12 -4)2 ]
= 80 - ( 130 - 82 )
= 80 - 116
= -36
b) 541 + (218 - b) = 735
218 - b = 194
b = 24
c) 5(x + 35) =515
x+35 = 103
x = 68
d) 96 - 3(x + 1) = 42
3(x+1) = 54
x+1 = 18
x = 17
12x - 33 = 32 . 33
12x - 33 = 243
12x = 276
x = 23
33 + 41 x 33 + 42 x 33 + 16 x 33
= 33 x 1 + 41 x 33 + 42 x 33 + 16 x 33
= 33 x ( 1 + 41 + 42 + 16 )
= 33 x 100
= 3300
\(A=\dfrac{1}{3}+\dfrac{1}{3^2}+\dfrac{1}{3^3}+\dfrac{1}{3^4}+...+\dfrac{1}{3^{99}}\)
\(\Rightarrow\dfrac{A}{3}=\dfrac{1}{3^2}+\dfrac{1}{3^3}+\dfrac{1}{3^4}+...+\dfrac{1}{3^{100}}\)
\(\Rightarrow A-\dfrac{A}{3}=\dfrac{2A}{3}=\left(\dfrac{1}{3}+\dfrac{1}{3^2}+\dfrac{1}{3^3}+...+\dfrac{1}{3^{99}}\right)-\left(\dfrac{1}{3^2}+\dfrac{1}{3^3}+\dfrac{1}{3^4}+...+\dfrac{1}{3^{100}}\right)\)
\(\Rightarrow\dfrac{2A}{3}=\left(\dfrac{1}{3^2}-\dfrac{1}{3^2}\right)+\left(\dfrac{1}{3^3}-\dfrac{1}{3^3}\right)+...+\left(\dfrac{1}{3^{99}}-\dfrac{1}{3^{99}}\right)+\left(\dfrac{1}{3}-\dfrac{1}{3^{100}}\right)=\dfrac{1}{3}-\dfrac{1}{3^{100}}\)
\(\Rightarrow2A=3\cdot\left(\dfrac{1}{3}-\dfrac{1}{3^{100}}\right)\)
\(\Rightarrow\text{A}=\dfrac{1-\dfrac{1}{3^{99}}}{2}\)
\(\Rightarrow A=\dfrac{1}{2}-\dfrac{1}{2.3^{99}}< \dfrac{1}{2}\)
a) 34 : x = 45 - 33
=> 34 : x = 12
=> x = 34 : 12
=> x = 17/6
b. 442 + x -2 = 250 + 121
=> 442 + x -2 = 371
=> x-2 = 371 - 442
=> x -2 = -71
=> x = ( -71 ) + 2
=> x = -69
c) 42 x 3 : x = 10 x 3 + 12
=> 126 : x = 42
=> x = 126 : 42
=> x = 3