Tìm x .
(x+1).(x+2).(x+5)-x^2.(x+8)= 27
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\(\left(x+1\right)\left(x+2\right)\left(x+5\right)-x^2\left(x+8\right)=27\)
\(\Leftrightarrow\left(x^2+3x+2\right)\left(x+5\right)-\left(x^3+8x^2\right)-27=0\)
\(\Leftrightarrow17x-17=0\\ \Leftrightarrow x=1\)
1: x=3/4-1/2=3/4-2/4=1/4
2: x-1/5=2/11
=>x=2/11+1/5=21/55
3: x-5/6=16/42-8/56
=>x-5/6=8/21-4/28=5/21
=>x=5/21+5/6=15/14
4: x/5=5/6-19/30
=>x/5=25/30-19/30=6/30=1/5
=>x=1
5: =>|x|=1/3+1/4=7/12
=>x=7/12 hoặc x=-7/12
6: x=-1/2+3/4
=>x=3/4-1/2=1/4
11: x-(-6/12)=9/48
=>x+1/2=3/16
=>x=3/16-1/2=-5/16
1)x= 1/4
2)x= 2/11+ 1/5
x= 21/55
3)x - 5/6 = 5/21
x = 5/21+5/6
x = 15/14
4)x/5 = 5/6 + -19/30
x:5 = 1/5
x = 1/5.5
x = 1
5) |x| - 1/4 = 6/18
|x| = 6/18 - 1/4
|x| =7/12
⇒x= 7/12 hoặc -7/12
6)x = -1/2 +3/4
x= 1/4
7) x/15 = 3/5 + -2/3
x:15 = -1/15
x = -1/15. 15
x = -1
8)11/8 + 13/6 = 85/x
85/24 = 85/x
⇒ x = 24
9) x - 7/8 = 13/12
x = 13/12 + 7/8
x = 47/24
10)x - -6/15 = 4/27
x = 4/27 + (-6/15)
x = -34/135
11) -(-6/12)+x = 9/48
x= 9/48 - 6/12
x = -5/16
12) x - 4/6 = 5/25 + -7/15
x -4/6 = -4/15
x = -4/15 + 4/6
x = 2/5
(x + 1)(x + 2)(x + 5) − x2(x + 8) = 27
x2 + 2x + x + 2(x + 5) − x3 − 8x2 = 27
x2(x + 5) + 2x(x + 5) + x(x + 5) + 2(x + 5) − x3 − 8x2 = 27
x3 + 5x2 + 2x2 + 10x + x2 + 5x + 2x + 10 − x3 − 8x2 = 27
17x + 10 = 27
17x = 17
x = 17 : 17
x = 1
Vậy x = 1
a,2/5 = 2/5 ; 3/8=6/16 ; 1/9=3/27
b, 4/3=8/6 ; -1=-1 ; -4/-2=-8/4
tick cho mik nhé
(x+1).(x+2).(x+5)-x^2.(x+8)= 27
\(\Leftrightarrow\left(x^2+2x+x+2\right)\left(x+5\right)-x^3-8x^2-27=0\)
\(\Leftrightarrow x^3+5x^2+2x^2+10x+x^2+5x+2x+10-x^3-8x^2-27=0\)
\(\Leftrightarrow17x-17=0\)
\(\Leftrightarrow x=1\)
(x + 1).(x + 2).(x + 5) - x2.(x + 8) = 27
<=> x3 + 8x2 + 17x + 10 - x2 - 8x2 = 27
<=> 17x + 10 = 27
<=> 17x = 27 - 10
<=> 17x = 17
<=> x = 1
=> x = 1