Các câu hỏi tương tự
nguoi ta viet len bang 2013 so 1/2;1/3;...1/2014.moi lan thuc hien,nguoi ta xoa di hai so bat ki x,y tren bang roi viet them so x+y+xy(cac so con lai giu nguyen).Sau 2012 lan thuc hien thi tren bang con lai mot so.So do la
giup minh vs......
1.Tim tat ca cac so nguyen n ( lnl <1000) sao cho can(3n^2 +789) la mot scphuong chia het cho 3.
2. Biet rang x la mot so thuc khac 0, tim gtnn cua bieu thuc: Q = ( 2011,2012x^2 -2x +2013,2014)/(2014,2015x^2)
phép trù 12-15 co thuc hien duoc khong trong tap hop cac so tu nhien ?
tim he so cua x2 trong phep chia da thuc x5-7,834x3+7,851x2-4,568x+3,194 cho x-2,652
Tim cac so thuc x sao cho x+\(\sqrt{2017}\)va \(\frac{16}{x}-\sqrt{2017}\)deu la so nguyen to
Cho x,y la cac so thuc duong. Tim gia tri nho nhat cua bieu thuc:
\(P=\frac{xy}{x^2+y^2}+\left(\frac{1}{x}+\frac{1}{y}\right)\sqrt{2\left(x^2+y^2\right)}\)
a,Tim cac so a,b sao cho |2x+a| = |bx+5| voi moi x\(\in\)R
b,Cho a,b,c,d,e,f la cac so thuc thoa man: |ax+b| + |cx+d| = |ex+f| voi x\(\in\)R.
Biet a,c,e \(\ne\)0. C/m: ad=bc
cho x,y,z la cac so thuc duong thoa man x+y+z=1 tim min A=x^3/(x^2+xy+y^2)+y^3/(y^2+yz+z^2)+z^3/(z^2+zx+x^2)
cho x,y,z la cac so thuc thoa x+y+z=0, x+1>0, y+1>0, z+1>0. tim GTLN cua P=\(\frac{x}{x+1}+\frac{y}{y+1}+\frac{z}{z+4}\)
cho x,y,z,t la cac so duong. tim GTNN cua A=\(\frac{x-t}{t+y}+\frac{t-y}{y+z}+\frac{y-z}{z+x}+\frac{z-x}{x+t}\)