\(\left(x+2\right)^2-x^2+2x-1\)
\(=\left(x+2\right)^2-\left(x-1\right)^2\)
\(=\left(x+2-x+1\right)\left(x+2+x-1\right)\)
\(=3\left(2x+1\right)\)
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)
Giải phương trình sau
C x-2/c+2+3/x-2=x^2-11/x^2-4
D 2/x+1-1/x-2=3x-11/(x+1)(x-2)
E x+3/x-2-1/x=2/x^2+2x
F x+2/x-2-1/x=2/x(x-2)
G 3x-1/x-1-2x+5/x-3=1
H 2x/2x-1+x/2x+1=1+4/(2x-1)(2x+1)
giải phương trình:
a, 1+2x-5/6=3-x/4
b, x+3/x+1+x-2/x=2
c, x-2/x+2+3/x-2=x^2-11/x^2-4
d,2/x+1-1/x-2=3x-11/x+1*x-2
e,x+2/x-2-1/x=2/x^2-2x
f, x+2/x-2-1/x=2/x*(x-2)
g,3x-1/x-1=2x+5/x-3
h,2x/2x-1+x/2x+1=1+4/2x-1*2x+1
mình cần bài này gấp ạ
thực hiện phép tính
a, 2x-1/2x+1 :(2x-1+2-4x/2x+1)
b,(1/1-x -1) : (x- 1-2x/1-x +1)
c,(1/x + x-2/x^2 -4 -2+x/x^2+2x):(x^2+2x+1)/x^2
d,{1/x^2 + 1/y^2 + 2/ x+y.(1/x + 1/y )} : x^3+y^3/x^2+y^2
Quy đồng mẫu các phân thức:
1) 7x-1/2x^2+6x; 3-2x/x^2-9
2) 2x-1/x-x^2; x+1/2-4x+2x^2
3) x-1/x^3+1; 2x/x^2-x+1; 2/x+1
4) 7/5x; 4/x-2y; x-y/8y^2-2x^2
5) x/x^3-1; x+1/x^2-x; x-1/x^2+x+1
6) x/x^2-2ax+a^2; x+a/x^2-ax
P)(9-x)(x^2+2x-3) n)(-x+3)(x^2+x+1) O)(-6x+1/2)(x^2-4x+2) q)(6x+1)(x^2-2x-3) r)(2x+1)(-x^2-3x+1) U)(2x-3)(-x^2+x+6) s)(-4x+5)(x^2+3x-2) V)(-1/2x+3)(2x+6-4x^3)
Giải phương trình:
a) x+1/x-2 + x-1/x+2 = 2(x^2+2)/x^2-4
b) 2x+1/x^2-5x+4 + 5/x-1 = 2/x-4
c) 2x^2/x^3-8 + x+1/x^2+7x+12 +1/x^2+9x+20 + 1/x^2+11x+30 = 1/15
d) x+4/2x^2-5x+2 + x+1/2x^2-7x+3 = 2x+5/2x^2-7x+3
Thực hiên phép tính
a)\(\dfrac{x^2+2}{x^3+1}\)-\(\dfrac{1}{x+1}\)
b)\(\dfrac{x}{x^2-2x}\)-\(\dfrac{x^2+4x}{x^3-4x}\)-\(\dfrac{2}{x^2+2x}\)
c)\(\dfrac{1}{2-2x}\)-\(\dfrac{3}{2+2x}\)+\(\dfrac{2x}{x^2-1}\)
a)x-3/x-2 + x-2/x-4 = -1
b)3x + 12 = 0
c)5 + 2x = x - 5
d)2x(x - 2) + 5(x - 2) = 0
e)3x-4/2 = 4x+1/3
f)2x/x-1 - x/x+1 =1
g)2x/x-1 + 3-2x/x+2 = 6/(x-1)(x+2)
tìm x
a,(3x-4)(3x+4)-(3x+1)2=0
b,(2x-5)2-(2x+1)(2x-1)=0
c,(3x-1)2-2(3x-1)(-3x)+(x-3)2=25
d,(x-1)(x2+x+1)=7
e,(x+2)(x2-2x+4)=-19
giút gọn
a,(x-1)(x2+x+1)-(x+2)(x2-2x+4)
b,(x-2)(x2+2x+4)-(x+2)(x-2)-x(x2-2)
c,(2x-1)(4x2+2x+1)+(2x+1)(4x2-2x+1)
