52 x X - 3 x 52 = 53 x 3
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a) 5.22 + (x + 3) = 52
5.4 + (x + 3) = 25
20 + (x + 3) = 25
x + 3 = 25 – 20
x + 3 = 5
x = 5 – 3 = 2
b) 23 + (x – 32) = 53 - 43
8 + (x – 9) = 125 – 64
8 + (x – 9) = 61
x – 9 = 61 – 8
x – 9 = 53
x = 53 + 9 = 62
a) \(5.2^2+\left(x+3\right)=5^2\)
\(x+3=5^2-5.2^2\)
\(x+3=25-20\)
\(x+3=5\)
\(x=2\)
b) \(2^3+\left(x-3^2\right)=5^3-4^3\)
\(8+\left(x-9\right)=125-64\)
\(x-9=53\)
\(x=62\)
a) 20-( x - 5 ) x2 = 2
( x - 5 ) x2 = 20-2=18
x - 5 = 18 : 2
x - 5 = 9
x = 9+5
x = 14.
b) 150 : ( 38 - 2x ) = 5
38 - 2x = 150 : 5 = 30
2x = 38 - 30 = 8
x = 8 : 2
x = 4.
1.3.5.7........99 = \(\frac{\left(1.3.5.7......99\right)\left(2.4.6......100\right)}{2.4.6......100}\)= \(\frac{1.2.3......99.100}{2^{50}\left(1.2.3.....50\right)}=\frac{51.52.53.......100}{2.2.2......2}=\frac{51}{2}.\frac{52}{2}....\frac{100}{2}\)(ĐPCM)
50 số 2
a: \(\Leftrightarrow\dfrac{x-51}{9}-1+\dfrac{x-52}{8}-1=\dfrac{x-53}{7}-1+\dfrac{x-54}{6}-1\)
=>x-60=0
hay x=60
b: \(\Leftrightarrow\left(x-2\right)^2-3\left(x+2\right)=x-14\)
\(\Leftrightarrow x^2-4x+4-3x-6-x+14=0\)
\(\Leftrightarrow x^2-8x+12=0\)
=>(x-2)(x-6)=0
=>x=2(loại) hoặc x=6(nhận)
\(\dfrac{x-6}{50}+\dfrac{x-6}{51}=\dfrac{x-6}{52}+\dfrac{x-6}{53}\)
\(\Rightarrow\dfrac{x-6}{51}+\dfrac{x-6}{50}-\dfrac{x-6}{52}-\dfrac{x-6}{53}=0\)
\(\Rightarrow\left(x-6\right)\left(\dfrac{1}{50}+\dfrac{1}{51}-\dfrac{1}{52}-\dfrac{1}{53}\right)=0\)
\(\Rightarrow x-6=0\) \(\Rightarrow x=6\)
Vậy ...
x-6/50+x-6/51=x-6/52+x-6/53
x+x-x-x=6/50+6/51-6/52-6/53
0x=6/50+6/51-6/52-6/53(vô ly)
=>ko tồn tại giá trị x
12 x 50 + 8 x 27 + 6 x 52 + 24 x 53
= 24 x 25 + 24 x 9 + 24 x 13 + 24 x 53
= 24 x ( 25 + 9 + 13 + 53 )
=24 x100
= 2400
12 x 50 + 8 x 27 + 6 x 52 + 24 x 53
=24 x 25 + 24 x 9 +24 x 13 + 24 x 53
=24 x(25 + 9 + 13 + 53)
=24x100
=2400
<=> 52 * x - 156 = 159
<=> 52 * x = 159 + 156
<=> 52 * x = 315
=> x = 315 : 52
=> x = .....................Tự tính
52(x-3)=53*3
x-3=53*3/52= 3.0.....
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