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18 tháng 12 2016

hinh nhu la de bi sai 

31 tháng 3 2016

(x2-3x+2)(x2-9x+20) đề thiếu vp

28 tháng 5 2017

Câu 1:

\(3x\left(12x+4\right)+9x\left(4x+3\right)\)

\(\Leftrightarrow3x\left(12x+4\right)+3x\left[3.\left(4x+3\right)\right]\)

\(\Leftrightarrow3x\left(12x+4\right)+3x\left(12x+6\right)\)

\(\Leftrightarrow3x\left[12x+4+12x+6\right]\)

\(\Leftrightarrow3x.\left(24x+10\right)\)

\(\Leftrightarrow72x^2+30x\)

Câu 2:

\(x\left(5+2x\right)+2x^2\left(x-1\right)\)

\(\Leftrightarrow5x+2x^2+2x^3-2x^2\)

\(\Leftrightarrow2x^3+5x\)

28 tháng 5 2017

Đề 1

  • Use different phrasing or notations
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Other tips for using Wolfram|Alpha:
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Input:

 
1>3 x (12 x + 4) + 9 x (4 x + 3)

Open code

 
 
 

Inequality plot:

 
 
| | 1  | 3 x (24 x + 13)

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EnlargeDataCustomizeA PlaintextInteractive
 

Alternate forms:

1>3 x (24 x + 13)

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3 x (24 x + 13)<1

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768/67 (x + 13/48)^2<1
 
 
 

Expanded form:

1>72 x^2 + 39 x

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Solution:

  • Approximate form
1/48 (-13 - sqrt(201))<x<1/48 (sqrt(201) - 13)

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Integer solution:

x = 0

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26 tháng 6 2019

a,3xn(6xn−3+1)−2xn(9xn−3−1)a,3xn(6xn−3+1)−2xn(9xn−3−1)

=xn[3(6xn−3+1)−2(9xn−3−1)]=xn[3(6xn−3+1)−2(9xn−3−1)]

=xn(18xn−3+3−18xn−3+2)=xn(18xn−3+3−18xn−3+2)

=5xn=5xn

b,5n+1−4.5nb,5n+1−4.5n=5n.5+5n.4=5n(5+4)=45n=5n.5+5n.4=5n(5+4)=45n

c,62.64−43(36−1)c,62.64−43(36−1)

=66−43.36+43=66−43.36+43

=26.36−43.36+43=26.36−43.36+43

=36(26−43)+43=36(26−43)+43

=36[(22)3−43]+43=36.0+43=43=64

~Hok tốt~

26 tháng 6 2019

TL:
a)

=\(18x^{2n-3}+3x^n-18x^{2n-3}+2x^n\) 

=\(6x^n\) 

b)

=\(5^n.5-4.5^n\) 

=\(5^n\left(5-4\right)\) 

=\(5^n\) 

vậy.......

hc tốt

2 tháng 2 2016

(x2-3x+2)(x2​-9x+20)=40

=>x=0 hoặc 6