nhân cả 2 vế với 100 ta được:
ab x 99 = aabb = 11 x a0b
ab x 9 = a0b
a x 90 + b x 9 = a x 100 + b
b x 8 = a x 10
b x 4 = a x 5
Vậy a=4; b=5. Hay a,b= 4,5
tim a ; b ;c ;d biet
ab,cd-a,bcd=11,106
tim a,b biet (chu y :a,b la so thap phan)
a,b * 9,9=aa,bb
Tim x , biet : 5 < x < 6 va
a] x la so tu nhien
b] x la so thap phan co 1 chu so o phan thap phan
Cac ban oi , giai nhanh bai nay cho minh voi , mai minh da hoc roi . Ban nao giai nhanh va dung se duoc minh bam like nhieu . Cam on cac ban nhieu nhe
Cho so thap phan A chuyen dau phay cua so thap phan A sang ben phai mot hang ta duoc so thap phan B , biet B - A = 222,12 . Tim so thap phan do .
giai ra
Khi cong 1 so tu nhien voi 1 so thap phan mot hoc sinh so y viet nhan dau phay cua so thap phan sang ben phai 1 hang nen tim duoc tong sai la 591,4 . Tim so thap phan do , biet tong dung = 480,34.
Khi cong 1 so tu nhien voi 1 so thap phan mot hoc sinh so y viet nhan dau phay cua so thap phan sang ben phai 1 hang nen tim duoc tong sai la 591,4 . Tim so thap phan do , biet tong dung = 480,34.
1. khi nhan mot so thap phan co hai chu so o phan thap phan voi 12,35,mot ban da dat tich rieng thang cot voi nhau nhu doi voi phep cong va co ket qua la 220,66. Hay tim ket qua dung cua phep nhan do . Biet rang cac dau phay o cac thua so va ket qua van dat thang cot voi nhau ?
2.tim 2 so biet thuong cua chung bang 1,2 va biet hieu cua chung bang 13,58 ?
ai lam nhanh se duoc tick day ?
Cho so thap phan A chuyen dau phay cua so thap phan A sang ben phai mot hang ta duoc so thap phan B , biet B - A = 222,12 . Tim so thap phan do .
co ai giup tui khong tui can gap lam
BAI 1 : Cho day so : 5,21,53,101,165....
A.So 23765 la so hang thu may cua day?
B.So hang thu 87 la day so nao
BAI 2 : Hay chia 1022 qua cam thanh cac phan sao cho phan thu hai gap doi phan thu nhat , phan thu ba gap doi phan thu hai ... va theo cach chia nay phan thu nam co 32 qua . Hoi chia nhu the thi duoc may phan ?
BAI 3 : Trong mot tran thi dau dien kinh , cac van dong vien mang so 1,2,3 va 4 gianh duoc bon giai dau tien , nhung khong van dong vien nao gianh duoc giai trung voi so ao cua minh ca . Biet rang van dong vien dat giai 4 thi mang so ao trung voi giai cua van dong vien mang ao so 2 ; van dong vien thu 3 thi gianh duoc giai nhat , van dong vie so 2 khong gianh duoc giai ba . Hoi moi van dong vien gianh duoc giai gi ?
BAI 4 : Cho tam giac ABC ,E la mot diem tren canh BC sao cho BC=3EC . Noi AE lay mot diem M sao cho AE=4AM . Duong thang qua B va M cat canh AC tai D .
A . Tinh ti so AC : AD ?
B . so sanh dien tich AMD voi dien tich MBE
tim so thap phan A ,biet khi roi dau phay cua so thap phan A sang ben phai 1 chu so ta duoc so thap phan B ,roi dau phay cua so thap phan A sang trai 1 hang ta duoc so thap phan C .Tong cua 3 so A,B,C la 223,887