32x-3 = 9. 27
giúp mình với sos
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\(\dfrac{16}{27}xX=\dfrac{10}{27}-\dfrac{6}{27}\)
\(\dfrac{16}{27}xX=\dfrac{4}{27}\)
\(X=\dfrac{4}{27}:\dfrac{16}{27}\)
X=\(\dfrac{1}{4}\)
16/27x X+2/9=10/27
16/27x X=10/27-2/9
16/27x X=4/27
X=4/27:16/27
X=1/4
a)x7+x5+1=x7+x6-x6+2x5-x5+x4-x4+x3-x3+x2-x2+1
=x7-x6+x5-x3+x2+x6-x5+x4-x2+x+x5-x4+x3-x+1
=x2(x5-x4+x3-x+1)+x(x5-x4+x3-x+1)+1(x5-x4+x3-x+1)
=(x2+x+1)(x5-x4+x3-x+1)
b)4x4-32x2+1=4x4+12x3+2x2-12x3-36x2-6x+2x2+6x+1
=2x2(2x2+6x+1)-6x(2x2+6x+1)+1(2x2+6x+1)
=(2x2-6x+1)(2x2+6x+1)
c)x6+27=(x2+3)(x2-3x+3)(x2+3x+3)
d)3(x4+x2+1)-(x2+x+1)
=3x4-3x3+2x2+3x3-3x2+2x+3x2-3x+2
=x2(3x2-3x+2)+x(3x2-3x+2)+1(3x2-3x+2)
=(x2+x+1)(3x2-3x+2)
e)bạn tự làm nhé
\(\dfrac{1}{4}\)+\(\dfrac{9}{20}\)
=\(\dfrac{5}{20}\)+\(\dfrac{9}{20}\)=\(\dfrac{5+9}{20}\)=\(\dfrac{14}{20}\)=\(\dfrac{7}{5}\)
hình như đề sai vì x + (-2/3) không thể bằng x + 1/4 đúng k nhỉ :)
2x3 - 32x = 0
=> 2x.(x2 - 16) = 0
=> 2x = 0 hoặc x2 - 16 = 0
=> x = 0 hoặc x2 = 16
=> x = 0 hoặc x thuộc {4 ; -4}
Vậy x thuộc {0 ; 4 ; -4}
-1 . \(\dfrac{5}{27}\) - \(\left(3x.\dfrac{7}{9^{ }}\right)^3\) = -\(\dfrac{24}{27}\)
\(\Rightarrow\) \(\dfrac{-5}{27}\) - \(\left(3x.\dfrac{7}{9^{ }}\right)^3\) = \(\dfrac{-24}{27}\)
\(\Rightarrow\) \(\left(3x.\dfrac{7}{9^{ }}\right)^3\) = \(\dfrac{-5}{27}\) - \(\dfrac{-24}{27}\) = \(\dfrac{19}{27}\)
\(\Rightarrow\) \(3^3\) . \(\dfrac{7^3}{3^6}\) = \(\dfrac{19}{3^3}\)
\(\Rightarrow\) \(\dfrac{x^3.7^3}{3^3}\) = \(\dfrac{19}{3^3}\)
\(\Rightarrow\) \(x^3\) . \(7^3\) = 19
( 1 + 2 + 3 + ... + 8 + 9 + 10 ) x ( 6 x 8 - 48 )
= ( 1 + 2 + 3 + ... + 8 + 9 + 10 ) x ( 48 - 48 )
= ( 1 + 2 + 3 + ... + 8 + 9 + 10 ) x 0 = 0
=(1+2+3+.....+8+9+10) x (48-48)
=(1+2+3+.....+8+9+10) x 0
= 0
32x-3 =32.33 = 35
2x - 3 = 5
2x = 8
x=4