Thay * bang cac chu so nao de duoc so 25*3 chia het cho 3 va ko chia het cho 9
Lam ca loi giai nha ,ai lam nhanh va dung minh se tick cho nha .Minh dang can gap .
Cho goc bet xOy , ve tia Oz sao cho goc xOz bang 120 do. Goi Om,On lan luot la tia phan giac cua cac goc xOz va yOz.
a) Oz co phai la ta phan giac cua goc yOm khong?
b) tinh goc mOn
Ai lam duoc minh se tick cho , vi bay gio minh cung dang can gap lam!
G=1^2+2^2^2+3^2+...........................+2019^2 CAC BAN OI LAM HO MINH VOI
CAN GAP LAM ,ai giai duoc minh tick cho
Tim n thuoc Z de:
a,4n-5 chia het cho n-7
b,n2-7 la boi cua n+3
c,2n-1 la uoc cua 3n+2
d,n+3 la boi cua n2-7
Ai lam dung va day du nhat minh se tick cho
ko nhat thiet phai lam het
cho phan so duong m/n toi gian .chung to m/n+m*n la phan so toi gian
ai dang len lam ho minh nha
nguoi dau tien minh se tick vi nick cua minh chi duoc tick co 1 cai cho 1 cau tra loi thoi
minh can ngay lam ho nha
x x x x x
1 Tính hợp lý
215.62+42-52.215
minh can gap lam ai lam dung minh tich cho nhieu that la nhieu
(-4).(+125).(-25).(-6).(-8) . ai lam duoc cho like , cach lam
\(\frac{-1}{2}-\left(\frac{3}{2}+x\right)=-2\)\(2\)
NHANH NHA MINH DANH CAN GAP LAM,AI TRA LOI DUOC MINH CHO 10 TICK
Khi chia so a cho 18 ta duoc so du la 6. Hoi:
a) so a co chia het cho 6 khong?
b) so a co chia het cho 9 khong?
Cac ban nho giai thi ghi cach lam ra dum minh nha can gap lam do!!!!!!