tìm x
10-2(4-3x)=-4
Tìm x :
a) (x + 3)2 + ( 4 + x).(4 - x) = 10
b) 9.(x+1)2 - (3x-2).(3x+2) = 10
a) (x+3)² + (4+x)(4-x) = 10
x² + 6x + 9 + 16- x² = 10
6x + 25 = 10
6x = -15
x = -15/6
b) 9(x+1)² - (3x-2)(3x+2) = 10
9x² + 18x + 9 - 9x² + 4 =10
18x + 13 = 10
18x = -3
x = -1/6
a) ( x + 3 )2 + ( 4 + x )( 4 - x ) = 10
⇔ x2 + 6x + 9 + 16 - x2 = 10
⇔ 6x + 25 = 10
⇔ 6x = -15
⇔ x = -15/6 = -5/2
b) 9( x + 1 )2 - ( 3x - 2 )( 3x + 2 ) = 10
⇔ 9( x2 + 2x + 1 ) - ( 9x2 - 4 ) = 10
⇔ 9x2 + 18x + 9 - 9x2 + 4 = 10
⇔ 18x + 13 = 10
⇔ 18x = -3
⇔ x = -3/18 = -1/6
a) \(\left(x+3\right)^2+\left(4+x\right)\left(4-x\right)=10\)
\(x^2+6x+9+16-x^2=10\)
\(6x+25=10\)
\(6x=-15\)
\(x=-\frac{5}{2}\)
b) \(9.\left(x+1\right)^2-\left(3x-2\right)\left(3x+2\right)=10\)
\(9.\left(x^2+2x+1\right)-9x^2+4=10\)
\(9x^2+18x+9-9x^2+4=10\)
\(18x+13=10\)
\(18x=-3\)
\(x=-\frac{1}{6}\)
Tìm x 3x( 4/3x + 1) - 4x(x - 2 ) = 10
4x2 + 3x - 4x2 + 8x - 10 = 0
11x - 10 = 0
x = 10/11
\(3x\left(\dfrac{4}{3}x+1\right)-4x\left(x-2\right)=10\)
\(\Leftrightarrow4x^2+3x-4x^2+8x=10\)
\(\Leftrightarrow x=\dfrac{10}{11}\)
\(3x\left(\dfrac{4}{3}x+1\right)-4x\left(x-2\right)=10\\ \Leftrightarrow4x^2+3x-4x^2+8x=10\\ \Leftrightarrow11x=10\Leftrightarrow x=\dfrac{10}{11}\)
tìm x biết 10-2.(4-3x)=-4
=>2(4-3x)=14
=>4-3x=7
=>3x=-3
hay x=-1
Tìm x 10 - 2(4 -3x) = -4
\(10-2\left(4-3x\right)=-4\)
\(\Leftrightarrow10-8+6x=-4\)
\(\Leftrightarrow2+6x=-4\)
\(\Leftrightarrow6x=-4-2\)
\(\Leftrightarrow6x=-6\)
\(\Leftrightarrow x=\frac{-6}{6}\)
\(\Leftrightarrow x=-1\)
\(\text{Vậy }x=-1\)
10 - 2(4 - 3x)= -4
=> 10 - 8 + 6x = -4
=> 6x = -4 + 8 -10
=> 6x = -6
=> x = -1.
Vậy x = -1
10 - 2( 4 - 3x ) = -4
=> 10 - 8 + 6x = -4
=> ( 10 - 8 + 4 ) = 6x
=> 6 = 6x => x = 1
Tìm x
3x ( 4/3x +1 ) - 4x ( x-2 ) = 10
\(4x^2+3x-\left(4x^2+8x\right)=10\)
\(4x^2+3x-4x^2-8x=10\)
\(-5x=10\)
\(x=10:\left(-5\right)=-2\)
Tìm x :
a. 10 x X - 1 - 3 - 5 - 7 - .... - 19 = 2 + 4 + 6 + .... + 20 .
b. 3x / 2 + 3x / 6 + 3x / 12 + 3x / 20 + 3x / 30 = 10
a ) 10 x X - 1 - 3 - 5 - 7 - ... - 19 = 2 + 4 + 6 + ... + 20
10 x X - 1 - 3 - 5 - 7 - ... - 19 = 110
10 x X - ( 1 + 3 + 5 + 7 + ... + 19 ) = 110
10 x X - 100 = 110
10 x X = 110 + 100
10 x X = 210
X = 210 : 10
X = 21
a 10 x X-1-3-5-7-....-19 = 2+4+6+....+20
10xX-1-3-5-7-....-19=110
10xX=110+1+3+5+7+....+19
10xX=210
X=210:10
X=21
b là 4
Tìm x:
10-2(4-3x)=-4
=> 2(4-3x)=10-(-4)
=> 2(4-3x)=14
=> 4-3x=14:2
=> 4-3x=7
=> 3x=4-7
=> 3x=-3
=> x=(-3):3
=> x=(-1)
10-2(4-3x)=-4
2(4-3x)=10--4
2(4-3x)=14
4-3x=14:2
4-3x=7
3x=4-7
3x=-3
x=-3:3
x=-1
Tìm x
2.(x-1)+3.(3x-2)=x-4
3.(4-x)-2.(x-1)=x+20
4.(2x+7)-3.(3x-2)=24
3.(x-2)+2x=10
\(2\left(x-1\right)+3\left(3x-2\right)=x-4\)
\(2x-2+9x-6=x-4\)
\(2x+9x-x-2-6=-4\)
\(10x-2-6=-4\)
\(10x-2=2\)
\(10x=4\)
\(x=\frac{2}{5}\)
Vậy \(x=\frac{2}{5}\)
\(3\left(4-x\right)-2\left(x-1\right)=x+20\)
\(12-3x-2x+2=x+20\)
\(12-5x+2=x+20\)
\(12-5x-x+2=20\)
\(12-6x+2=20\)
\(12-6x=18\)
\(6x=-6\)
\(x=-1\)
Vậy \(x=-1.\)
\(4\left(2x+7\right)-3\left(3x-2\right)=24\)
\(8x+28-9x+6=24\)
\(8x-9x+28+6=24\)
\(-x+34=24\)
\(-x=-10\)
\(x=10\)
Vậy \(x=10\)
\(3\left(x-2\right)+2x=10\)
\(3x-6+2x=10\)
\(3x+2x-6=10\)
\(5x=16\)
\(x=\frac{16}{5}\)
Vậy \(x=\frac{16}{5}\)
2(x-1)+3(3x-2)=x-4
=>2x-2=9x-6-x+4=0
=>10x-4=0
=>x=\(\frac{2}{5}\)
3(4-x)-2(x-1)=x+20
=>12-3x-2x+2-x-20=0
=>-6x-6=0
=>-6(x-1)=0
=>x-1=0
=>x=1
4 . (x - 10) - (-3x + 4) = -2 . (x + 5) - (-4x + 20)
tìm x
4(x - 10) - (-3x + 4) = -2(x + 5) - (-4x +20)
=> 4x - 40 + 3x - 4 = -2x - 10 + 4x - 20
=> 7x - 44 = 2x - 30
=> 7x - 2x = -30 + 44
=> 5x = 14
=> x = 14 : 5
=> x = 14/5
\(4\left(x-10\right)-\left(-3x+4\right)=-2\left(x+5\right)-\left(-4x+20\right)\)
\(\Rightarrow4x-40+3x-4=-2x-10+4x-20\)
\(\Rightarrow4x+3x+2x-4x=-10-20+4+40\)
\(\Rightarrow5x=14\Rightarrow x=\frac{14}{5}\)
\(4(x-10)-(-3x+4)=-2(x+5)-(-4x+20)\)
\(\Rightarrow4x-40+3x-4=(-2)x-10+4x-20\)
\(\Rightarrow7x-44=2x-30\)
\(\Rightarrow7x-2x=44-30\)
\(\Rightarrow5x=14\)
\(\Rightarrow x=\frac{14}{5}\)
tìm x biết
a)(4-x)2+15=40
b)(3x-2)10=(3x-2)4
c)x=1+4+42+...+42017
a)(4-x)2+15=40
(4-x)2=40-15
(4-x)2=25
(4-x)2=52
=>4-x=5
x=5-4
x=1
a) ( 4 - x )2 + 15 = 40
( 4 - x )2 = 40 - 15
( 4 - x )2 = 25
( 4 - x )2 = 52
4 - x = 5
x = 4 - 5
x = ( - 1 )
b, ( 3x - 2 )10 = ( 3x - 2 )4
=> x \(\in\left\{0;1\right\}\)
c, X = 1 + 4 + 42 + ......... + 42017
4X = 4 + 41 + ......... + 42018
4X - X = ( 4 + 41 + ........ + 42018 ) - ( 1 + 4 + 42 + ......... + 42017 )
4X - X = 4 + 41 + ......... + 42018 - 1 - 4 - 42 - ......... - 42017
=> 3X = 42018 - 1
=> X = \(\frac{4^{2018}-1}{3}\)