Violympic toán 8
Các câu hỏi tương tự
Tìm x , biết :
1, x3 - 2x2 - 2x = 0
2, 2x3 - 5x2 + 8x - 3 = 0
3, 3x3 - 14x2 + 4x + 3 = 0
4, x3 + 6x2 - 5x = 0
Tìm x biết
(x+3)2-(x-2)(x+3)+(2x+1)3=6x(2x+1)+(2x-3)(4x2+6x+9)
Tìm x, biết:
a) \(\left(2x-1\right)^2-4x^2+1=0\)
b) \(6x^3-24x=0\)
c) \(2x\left(x-3\right)-4x+12=0\)
d) \(x^3-5x^2+x-5=0\)
Bài 4:
a, Tìm GTLN
\(Q=-x^2-y^2+4x-4y+2\)
b, Tìm GTLN
\(A=-x^2-6x+5\)
\(B=-4x^2-9y^2-4x+6y+3\)
c, TÌm GTNN
\(P=x^2+y^2-2x+6y+12\)
Câu 1. Giải các phườn trình sau:
a, 3x+60
b, 2x-100
c, 3x-711
d, 3x-90
e, 3x(2-x) 15(x-2)
f, (x+5)(x+4)0
g, x(x+4)0
h, (2x -4)(x-2)0
i, (x+1/5)(2x-3)0
k, x²-4x0
m, 4x²-10
n, x²-6x+90
l, (3x-5)²-(x+4)²0
o, 7x(x+2)-5(x+2)0
p, 3x(2x-5)-4x+100
q, (2-2x)-x²+10
r, x(1-3x)5(1-3x)
s, 2x-3/4+x+1/63
t, x-3/4-2x+1/3x/6
u, x+1/13+x+2/12x+3/11+x+4/10
v, 2x+1/15+2x+2/142x+3/13+2x+4/12
Giúp e nha mn. E cảm ơn trc ạ!
Đọc tiếp
Câu 1. Giải các phườn trình sau:
a, 3x+6=0
b, 2x-10=0
c, 3x-7=11
d, 3x-9=0
e, 3x(2-x) =15(x-2)
f, (x+5)(x+4)=0
g, x(x+4)=0
h, (2x -4)(x-2)=0
i, (x+1/5)(2x-3)=0
k, x²-4x=0
m, 4x²-1=0
n, x²-6x+9=0
l, (3x-5)²-(x+4)²=0
o, 7x(x+2)-5(x+2)=0
p, 3x(2x-5)-4x+10=0
q, (2-2x)-x²+1=0
r, x(1-3x)=5(1-3x)
s, 2x-3/4+x+1/6=3
t, x-3/4-2x+1/3=x/6
u, x+1/13+x+2/12=x+3/11+x+4/10
v, 2x+1/15+2x+2/14=2x+3/13+2x+4/12
Giúp e nha mn. E cảm ơn trc ạ!
Bµi 5: Gi¶i PT sau.
a,frac{5x-2}{2-2x}+frac{2x-1}{2}+frac{x^2+x-3}{1-x}1
b,frac{6x-1}{2-x}+frac{9x+4}{x+2}frac{3x^2-2x+1}{x^2-4}
c,frac{1}{x-1}+frac{2x^2-5}{x^3-1}frac{4}{x^2+x+1}
d) (x2 + 4x + 8)2 + 3x(x2 + 4x + 8) + 2x2 0
e) x4 + 2x3 + 4x2 + 2x + 1 0
f,frac{3x-1}{x-1}-frac{2x+5}{x+3}+frac{4}{x^2+2x-3}1
Đọc tiếp
Bµi 5: Gi¶i PT sau.
\(a,\frac{5x-2}{2-2x}+\frac{2x-1}{2}+\frac{x^2+x-3}{1-x}=1\)
b,\(\frac{6x-1}{2-x}+\frac{9x+4}{x+2}=\frac{3x^2-2x+1}{x^2-4}\)
\(c,\frac{1}{x-1}+\frac{2x^2-5}{x^3-1}=\frac{4}{x^2+x+1}\)
d) (x2 + 4x + 8)2 + 3x(x2 + 4x + 8) + 2x2 = 0
e) x4 + 2x3 + 4x2 + 2x + 1 = 0
\(f,\frac{3x-1}{x-1}-\frac{2x+5}{x+3}+\frac{4}{x^2+2x-3}=1\)
Giải các phương trình :
a) (2x + 5)2 = (x + 2)2
b) 2x3 + 6x2 = x2 + 3
c) 1 + 1/x +2 = 12/ 8 - x3
d) 2(1-2x)/4 - 2 + 3x/6 = 2 - 2(3x -1)/ 2
e) (x - 2)(2x - 3) = (4 - 2x)(x - 2)
f) 2x( x - 3) + 5(x - 3) = 0
g) 4x2 - 1 = (2x + 1)(3x - 5)
Tìm x biết:
a) ( x2 - 6x +9) -(x-3).(4x - 5) = 0
b) 16x2 -( x2 - 2x + 1)=0
a)x(x-5)=4x-20
b)4(x+6)-x\(^3-6x^2=0\)
c)x\(^3-5x^2+x-5=0\)
d)\(x^4-2x^3+10x^2-20x=0\)
e)\(\left(2x-3\right)^2=9\left(x-2^2\right)\)