\(\left(2x-1\right)\left(x-2\right)-\left(x+3\right)\left(2x-7\right)=0\)
\(\left(2x^2-x-4x+2\right)-\left(2x^2-7x+6x-21\right)=0\)
\(2x^2-5x+2-2x^2+x+21=0\)
\(-4x+23=0\)
\(-4x=-23\)
\(x=\dfrac{23}{4}\)
1) 2x – (3 – 5x) = 4( x +3)
2) 5(2x-3) - 4(5x-7) =19 - 2(x+11)
3) 5x - 4(6-x)(x + 3) = (4-2x)(3-2x) + 2
4) (x - 1)3 - (3x + 2)(-12) = (x2 + 1)(x - 2) - x2
5) (3x -1)2 - (x +3)(2x-1) = 7(x + 1)(x -2) -3x
mn giúp mình vs
1.giải phương trình :
1)1 + 2/x-1 + 1/x+3=x^2+2x-7/x^2+2x-3
2)x/x^2+5x+6=2/x^2+3x+2 (x=3)
3)1/x^2+9x+20 - 1/x^2+8x+12=x^2-2x-33/x^2+8x+15 (x=-5,7)
4)x+5/3x-6 - 1/2=2x-3/2x-4 (x=25/7)
5)x-1/x^3+1 + 2x+3/x^2-x+1=2x+4/x+1 - 2(x=0)
Chứng tỏ biểu thức không phụ thuộc x:
1) (x-5)(2x+3)-2x(x-3)+x+7
2) (x-3)(x2+3x+9)-x3+7
3) (2x-1)(x+5)-x(2x+9)+6
4) (x+2)(x2-2x+4)-x3-7
5) 8x3-(2x-1)(4x2+2x+1)-5
d) (3x – 5)(7 – 5x) – (5x + 2)(2 – 3x) = 4 g) 3(2x - 1)(3x - 1) - (2x - 3)(9x - 1) =0 j) (2x – 1)(3x + 1) – (4 – 3x)(3 – 2x) = 3 k) (2x + 1)(x + 3) – (x – 5)(7 + 2x) = 8 m) 2(3x – 1)(2x + 5) – 6(2x – 1)(x + 2) = - 6
(1 –x)(5x+3) = (3x -7)(x - 1)
5x - 4(6-x)(x + 3) = (4-2x)(3-2x) + 2
(3x -1)2 - (x +3)(2x-1) = 7(x + 1)(x -2) -3x
(2x - 3)(x-5) + (3-2x)(3x-4) = 0
giải phương trình sau
a.1/2+|x-3/2|=5/2
b,7/3|2x+1|=2
c.|2x-1|=x+2
d.|3-2x|=3x-1
e.|2x+1|=x-2
f.|2x+3|=|x-2|
g.|x-1|=|2x+5|
thực hiện phép tính
1)2x^2(-3x^2+2x-1)
2)(x-3)(x+7)-(x+5)(x-1)
3)-2x(-3x+2)-(x+2)^2
4)(2x-3)(x^2-2x-4)
A) 2x³+6x²=x²+3x
B) (2x+5)²=(x+2)²
C) x²-5x+6=0
D) (2x-7)²-6(2x-7)(x-3)=0
E) (x-2)(x+1)=x²-4
G) 2x(2x-3)=(3-2x)(2-5x)
H) (1-x)(5x+3)=(3x-7)(x-1)
F) (x+6)(3x-1)+x+6=0
I) (4x-1)(x-3)=(x-3)(5x+2)
K) (x+4)(5x+9)-x-4=0
H) (x+3)(x-5)+(x+3)(3x-4)=0
M) (2x+3)(-x+7)=0
a) |2x+1|=5
b) |2x+1|=0
c) |2x+1|=7
d) |2x+5|=|3x-7|
e) |2x+7|=x-1
g) |x-2|+|2x-3|=2
h) |x+2| + |1-x | =3x+2
Giúp mik với cần gấp ạ
Thực hiện phép tính:
a.(2x^2 + 2x - 4) : (x + 2)
b. ( 2x^3 - 5x^2 - x +1 ) : (2x + 1 )
c. (x^3 - 2x + 4)/(x + 2)
d. (x^3- 3x^2): (x - 3)
e. (x^4- x- 14): (x- 2)
f. (x^4- x- 14): (x- 2)
g. (17x^2- 6x^4+ 5x^3- 23x+ 7): (7- 3x^2- 2x)
giúp mik đi ạ mik đang cần gấp T-T
