1 CMR voi n E N thi (n+20132014)*(n+20142013) chia het cho 22 tim so tu nhien co hai chu so sao cho khi doi vi tri cua jai chu so roi vietthem chu so 0 vao ben phai hai chu so thi duoc 1 so gap 45 lan so ban dau4 cho doan thang AB diem M nam ngoai doan thang AB va AMB=90 do diem c nam giua hai diem A;B sao cho BMC=2/3 AMCtinh cac goc AMC;BMC5tinh 1/2+1/3+1/4+...+1/2014 /...
Đọc tiếp
1 CMR voi n E N thi
(n+20132014)*(n+20142013) chia het cho 2
2 tim so tu nhien co hai chu so sao cho khi doi vi tri cua jai chu so roi viet
them chu so 0 vao ben phai hai chu so thi duoc 1 so gap 45 lan so ban dau
4 cho doan thang AB diem M nam ngoai doan thang AB va AMB=90 do
diem c nam giua hai diem A;B sao cho BMC=2/3 AMC
tinh cac goc AMC;BMC
5tinh 1/2+1/3+1/4+...+1/2014 / 2013/1+2012/2+2011/3+...+1/2014
