3(5x -15) =2^2x17+52
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a)4(18 - 5x) - 12(3x - 7) = 15(2x - 16) - 6(x + 14)
<=>72 - 20x - 36x +84 = 30x - 240 - 6x 84
<=> -80x = -480
<=> x = 6
b) 5(3x+5)-4(2x-3) =5x+3(2x+12)+1
<=> 15x + 25 - 8x + 12 = 5x + 6x + 36 + 1
<=> 15x + 25 - 8x + 12 - 5x - 6x - 36 - 1 = 0
<=> -4x = 0
<=> x = 0
c) 2(5x-8)-3(4x-5)=4(3x-4)+11
= 10x - 16 - 12x + 15 = 12x - 16 + 11
= -14x = -4
= x =\(\frac{2}{7}\)
d) 5x-3{4x-2[4x-3(5x-2)]}=182
= 5x - 3 . [4x - 2(4x - 15x + 6)]
= 5x - 3 . (4x - 8x + 30x - 12)
= 5x - 12x + 24x - 90x + 36
= -73x + 36 = 182
=> -73x = 182 - 36 = 146
=> x = 146 : (-73) = -2
~Hok tốt~
a: =>(x-6)(x+2)=0
=>x=6 hoặc x=-2
b: \(\Leftrightarrow25x^2+10x+1-25x^2+9=30\)
=>10x=20
hay x=2
c: =>x3-1-x3+4x=5
=>4x=6
hay x=3/2
\(8x^2+2x-15=0\)
\(\Leftrightarrow8x^2-10x+12x-15=0\)
\(\Leftrightarrow2x\left(4x-5\right)+3\left(4x-5\right)=0\)
\(\Leftrightarrow\left(4x-5\right)\left(2x+3\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-\frac{3}{2}\\x=\frac{5}{4}\end{matrix}\right.\)
a: =>x^3+5x^2-15x-37=0
=>\(x\in\left\{3.22;-1.78;-6.44\right\}\)
b: =>8x^2+12x-10x-15=0
=>(2x+3)(4x-5)=0
=>x=5/4 hoặc x=-3/2
a) \(\left(5x+3^4\right).6^8=6^9.3^4\)
\(=>6x+3^4=3^4.6^9:6^8\)
\(=>6x+3^4=3^4.6\)
\(=>6x=6.3^4-3^4\)
\(=>6x=0\)
\(=>x=0:6\)
\(=>x=0\)
a/(5x + 34).68=69.34
(5x + 34) = 69:68.34
5x + 81 = 6.81
5x = 6.81 - 81
5x = 486 - 81
5x = 425
x = 425:5
x = 85
b/92 - 2x = 2.42- 3.4 + 120:15
92 - 2x = 2.16 - 12 + 8
92 - 2x = 32 - 12 + 8
92 - 2x = 28
2x = 92 - 28
2x = 64
x = 64:2
x = 32
c/53.(3x + 2) : 13 = 103: (135:134)
125.(3x + 2) : 13 = 1000:13
125.(3x+2) = 1000:13.13
125.(3x+2) = 1000
3x + 2 = 1000:125
3x + 2 = 8
3x = 8 - 2
3x = 6
x = 6:3
x = 2
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\(2x^3-5x^2+8x-3\)
\(=2x^3-x^2-4x^2+2x+6x-3\)
\(=x^2\left(2x-1\right)-2x\left(2x-1\right)+3\left(2x-1\right)\)
\(=\left(2x-1\right)\left(x^2-2x+3\right)\)
x^2 +5x^2-7x+15x-21=9
6x^2 +8x -12 =0
2(x^2 +4x -6) =0
x1= -2+căn 10
x2= -2-căn 10
x^2+(x+3)(5x-7)=9
<=>x^2+5x^2+8x-21-9=0
<=>6x^2+8x-30=0
<=>2(3x^2+4x-15)=0
<=>3x^2+4x-15=0
<=>3x^2-5x+9x-15=0
<=>x(3x-5)+3(3x-5)=0
<=>(x+3)(3x-5)=0
<=>x+3=0 hoặc 3x-5=0
+)x+3=0<=>x=-3
+)3x-5=0<=>3x=5<=>x=5/3
= ko biet