a:\(\left(x-1\right)\left(3-2x\right)+\left(2x-1\right)\left(x+3\right)=4\)
=>\(3x-2x^2-3+2x+2x^2+6x-x-3=4\)
=>10x-6=4
=>10x=10
=>\(x=\dfrac{10}{10}=1\)
b: \(\left(\dfrac{x}{2}+3\right)\left(5-6x\right)+\left(12x-2\right)\left(\dfrac{x}{4}+3\right)=0\)
=>\(\dfrac{5x}{2}-3x^2+15-18x+3x^2+36x-\dfrac{1}{2}x-6=0\)
=>\(20x+9=0\)
=>20x=-9
=>\(x=-\dfrac{9}{20}\)
bài 1: tính
a) -6x+3(7+2x)
b)15y-5(6x+3y)
c) x(2x+1)-x2(x+2)+(x3-x+3)
d)4(x-6)-x2(2+3x)+x(5x-4)3x2(x-1)
bài 2: tìm x
a)3x+2(5-x)=0
b)3x2-3x(-2+x)=36
c)5x(12x+7)-3x(20x-5)=-100
a)∣∣x2+∣∣6x−2||=x2+4
b)\(\left|2x+3\right|-2\left|4-x\right|=5\)
c)\(\left|x+3\right|+\left|x+1\right|=3x\)
tim nghiem cua cac da thuc
a,x^2+x
b,x^2+2x+1
c,2x^2+3x-5
d,x^2-4x+3
e,x^2+6x+5
f,3x(12x-4)-9x(4x-3)=30
g,2x(x-1)+x(5-2x)=15
a) x^2+2x+3
b) x^2+6x+5
c) X^3+3x^2+3x+1
d) 8x^3 - 12X^2 +6x-1
Tìm x
a) 6x(5x + 3) + 3x(1 – 10x) = 7 b) (3x – 3)(5 – 21x) + (7x + 4)(9x – 5) = 44
c) (x + 1)(x + 2)(x + 5) – x2(x + 8) = 27
d) 5x(12x + 7) – 3x(20x – 5) = - 100
e) 0,6x(x – 0,5) – 0,3x(2x + 1,3) = 0,138
Tìm x biết :
a, 4.(18 - 5x) - 12.(3x - 7) = 15.(2x - 16) - 6(x + 14)
b, 5.(3x + 5) - 4.(2x - 3) = 5x + 3.(2x + 12) + 1
c, 2.(5x - 8) - 3.(4x - 5) = 4.(3x - 4) + 11
d, (3x + 2)(2x + 9) - (x + 2)(6x + 1) = (x + 1) - (x - 6)
e, (8x - 3)(3x + 2) - (4x + 7)(x + 4)= (2x + 1)(5x - 1) - 33
Tìm x biết
a)|x-1|+|x-3|=4
b) |x^2+|6x-2||=x^2+4
c) |2x+3|-2|4-x|=5
: Tìm x, biết:
a) 3x( 4x- 1) - 2x(6x- 3 )=30 b) 2x(3-2x) + 2x(2x-1)=15
c) (5x-2)(4x-1) + (10x +3)(2x - 1)=1 d) (x+2) (x+2)- (x -3)(x+1) = 9
e) (4x+1)(6x-3) = 7 + (3x – 2)(8x + 9) g) (10x+2)(4x- 1)- (8x -3)(5x+2) =14
Tìm x , mấy bạn giúp vs ạ .E có quàa
1 , | x - 9 | - x = 15 - ( -2) + |- 17|
2 , | 2x^2 + 1 | - 3x = 2x^2 - x + 5
3 , 3 - 5 . | x+1| = 24
4 , | 3-x | - 2x = 4
5 , | x+3| + | x-3 | + | x+6| = 6x - 18
6 , | x+2| + |x+3| = x
7 , | x-1| + |y-1| = 0
tìm x, biết
a,/x-3/+/x+2/=4
b,/2x-4/+/6x-18/=21
