Cho C= xmu 10- xmu 5+ x mu 2 - x mu 1 =1 tim x de C=0
Cho C= xmu 10- xmu 5+ x mu 2 - x mu 1 =1 tim x de C=0
cho x=\(\frac{5}{a-10}\).tim a de:
a,x la so huu ti
b,x la so huu ti am
c,x=-1
d,x<1
cho f(x)=\(\frac{x+2}{x-1}\)
a)tinh f(7)
b)tim x de f(x)=\(\frac{1}{4}\)
c)tim x de f(x)>1
Cho phan so:C=3|x| +2/4|x| -5.Tim x thuoc Z de C la so tu nhien
Cho C=x^10-x^5+x^2-x+1. tìm x để C=0
Cau 1; cho\(\frac{x}{2}=\frac{y}{5}\)vaxy=90. So cap (x;y) thoa man la
Cau 2 : Cho a+d=b+c va \(a^2+d^2=b^2+c^2\)(b,d khac 0).Khi do 4 so lap thanh ti le thuc nao
Cau 3 :GTLN cua phan so \(\frac{7n-8}{2n-3}\)
Cau 4: Cho A=\(\frac{12}{x-15}\) dieu kien de 0<A<1 va A>1
Cau 5 ; tim x biet /-x-5//x=5=10
Cau 6: tap hop cac so nguyen cua x thoa man (3x^2-51)^2014=(-24)^2014
Cau 7: tap hop cac so thoa man /x-y/+/y+9/25/=0
Tim x thuộc Z :
a) x^2-1/x^2 < 0
b) x^2 - 2/5 >= 0
c) x-2/x-6<0
Tim x biet
a) 3x+5-2(x+4)=4x+1/2b)(x+1)(x-1) <0c)(x-2)(x+2/3) >0