Violympic toán 7
Các câu hỏi tương tự
Bai 1: Tim x
a) \(|\text{x-1|+|2x+4|=3}\)
b) \(|x+\dfrac{1}{3}|=|3x-\dfrac{5}{6}|\)
c) 4x.\(\left(x+\dfrac{1}{2}\right)=0\)
d) 3x.(x+2)-5(x+2)=0
tim x, y, z biết 3x-1=2y-2, 4y=3z-1 và 2x+3y-z=50
cho2 đa thức P(x)=3x^3+1/2x-1-2x^2-5x^4
Q(x)=6x^4+3x^3-4x^2+1/2x-4
tính A(x)=P(x)- Q(x)
Rút gọn biểu thức
A= (3x-y).(3x+y)+(x-y)2
B= (2x+3).(2x-3)-(x-3)2+(2x-1).(x+2)
C= (2x-1)2 - 2.(2x-1).(x+1)+(x+1)2
Tim X
a,\(\left|2x+3\right|-2\left|4-x\right|=5\)
b, \(\left|x-1\right|+\left|x+3\right|=4\)
c, \(\left|x+3\right|+\left|x+1\right|=3x\)
Tim gtnn
\(A=\dfrac{3x^2+14}{x^2+4}\)
\(B=\dfrac{2x+1}{x^2+2}\)
Tim gtln cua tong x+y+z
y+5y=21 ; 2x+3z=51 ( x,y,z\(\ge\)0)
tim nghiem cua da thuc:
M(x)=(6-3x)(-2x+5)
N(x)=x^2+x
A(x)=3x-3
cho 2 đa thức:
A(x)=2x^3+2x-3x^2+1 B(x)=2x^2+3x^3-x-5
tim x biet:a)/x+1/+/3x-1/+/x-1/=3
b)/x-2/+/x-7/=4