10a/b=50
=> 10a=50b
=> a=5b
a+b=20; a=5b
=> 5b+b=20
=> 6b=20
=> b=20/6
=> b=10/3 ko pải stn
=> ko có a & b thỏa mãn.
10a/b=50
=> 10a=50b
=> a=5b
a+b=20; a=5b
=> 5b+b=20
=> 6b=20
=> b=20/6
=> b=10/3 ko pải stn
=> ko có a & b thỏa mãn.
co hai so tu nguyen a va b nao mà a chia het cho b va bchia het cho a ko ?
tim so 3a7b biet so do chia het cho 2 9 va 5 du1
tim 1 so biet so do chia het 1;2;3;4;5;6;7;;8;9;10 va nam trong khoang 5000den 6000
456b chia het cho 2 va 5
cho 6 chu so 1;2;3;4;5;6 . Tong cua tat ca cac so co 5 chu so khong chia het cho 5 lap duoc tu cac so tren la
Chứng tỏ : nếu ( a - 5b ) chia hết cho 13 thì ( 10a + b ) chia hết cho 13
2 thanh pho a va b cach nhau 165 km . Luc 7 goi 30 sang 1 xe may di tu A den B voi van toc 30 km/gio va luc 8 goi co 1 o to di nguoc chieu tu B den A voi van toc 45 km /gio . hoi : a, xe may va o to gap nhau luc may gio ? b, cho gap nhau cach A nao nhieu km
Ke DN ta co : DN//EB//EQ \RightarrowQC=QN
GOI O LA GIAO DIEM CUA CAC DUONG TRUNG TUYEN
DAT CQ=a QO=b ON=c
TA CO HE PHUONG TRINH SAU: a=b+c
( a+b)/(a+b+c)=2/3
TU DO \Rightarrowa=3c/2 VA b=c/2
\Rightarrowa/b=3\Rightarrowb/(a+b)=1/4
TUONG TU \RightarrowOP/OA=1/4
\RightarrowTG OQP ~TG OCA\RightarrowQP//AC
\RightarrowPQ=AC/4
TU DO \Rightarrow\RightarrowVA\Rightarrow DPCM
Cac bn kb vs mk nha,that ra mk co nick trong olm roi,con co rat nhieu bn nua,nhung nick cua mk bi 1 dua an cap va xoa het bn be cua mk,mk mong cac bn truoc co the kb lai vs mk,nhung nguoi ham mo Son Tung,Khoi My va bo phim co dau 8 tuoi.Mk noi the chac cac bn co the nho mk,mk rat mong cac bn giup do