minh se tink cho ban nao nhanh va dung nhat
minh se tink cho ban nao nhanh va dung nhat
hay chung minh y+x+m=0 khi y,x,m deu la so thap phan
cho x, y , z la cac so nguyen thoa man x . y - x. z + y.z - z^2 +1 =0 chung minh rang x+ y =0
cho x, y , z là các số nguyen thoa man x . y - x. z + y.z - z^2 +1 =0 chung minh rang x+ y =0
viet cac phep chia duoi dang phan so
a) m : 4 ( m thuoc Z)
b) 5 : a ( a thuoc Z , a khac 0 )
c) x : y ( x, y thuoc Z, y khac 0)
cho x,y thuoc z hay chung to rang
A neu x-y>0 thy x>y
B neu x>y thi x-y>0
cho x, y,z >0 chung minh rang\(\frac{x}{2x+y+z}+\frac{y}{2y+x+z}+\frac{z}{2z+x+y}< hoac=\frac{3}{ }4\)3/4
Chung minh rang: moi n thuoc z ( n khac 0,n khac -1) thi : Q =1\1.2+1\2.3+1\3.4+......+1\n(n+1) khong phai la so nguyen
cho x=a/b va y=b/m voi a,b,m thuoc Z ;m>0 va x<y .Chung minh rang Z=a+b/2m thi x<Z<t
tim x thuoc Z biet : | x-3| -7=-4
o the ket luan gi ve dau cua so nguyen x khac 0 neu biet : x+|x|=0
ai nhanh minh tick