tim so co 3 chu so co tong cac chu so la 20 va ti so giua chu so hang tram voi chu so hang don vi la 2, con chu so hang chuc bang voi chu so hang tram.
giai ro rang nhe
Tim so co 3 chu so co tong cac chu so la 20 va ti so giua chu so hang tram voi chu so hang don vi la 2 , con chu so hang chuc bang chu so hang tram
Gọi số đó là abc (a>0;a,b,c<10)
Ta có:
a=2c và a=b \(\Rightarrow\)b=2c
a+b+c=20
2c+2c+c=20
5c=20
c=4
=>a=8
Vậy abc=884
Ta co so do :
chu so hang tram [---------]-----------]
chu so hang chuc [----------]-----------] [ 20 ]
chu so hang don vi [----------]
chu so hang don vi la
20 : [2 + 2 +1 ]= 4
chu so hang tram va chuc la
4 x 2 = 8
so phai tim 884
Tim 1 so co 3 chu so biết chu so hang chuc bang tong chu so hang tram voi chu so hang don vi. Chia chu so hang tram cho chu so hang dọn vi ta được thương la 3 va du 1. Tich cua so tan cung voi 7 la mot so co chu so tan cung ben phai la 4
Tim so co 3 chu so biet chu so hang tram bang hieu giua chu so hang chuc voi chu so hang don vi . ta duoc thuong la 2 va du 2
giup minh voi minh sap di hoc roi
s lại đc thương là 2 dư 2 bn, chia cho bn vậy
dung do sao lai thuong 2 dư 2 ! chứng tỏ đề bài sai
[ thường luôn luôn lớn hơn dư 1 đơn vị ]
Như vậy là đề bài sai
ai thấy đúng hay tk mk ^_^
tong cac chu so cua 1 so co 3 chu so la 21 chu so hang don vi lon hon chu so hang chuc .neu ta doi vi tri chu so hang don vi va chu so hang tram thi duoc mot so moi co gia tri lon hon so cu la 198. tim so cu .
giup mk nhe
tim tat cac so tu nhien co ba chu so thoan man cac tinh chat sau : co tong cac chu so bang 9 chu so hang chuc lom hon chu so hang don vi la 2 don vi va neu ta doi chu so hang tram cho hang don vi thi duoc so moi lon hon so ban dau la 198 don vi
tim so tu nhien co 4 chu so biet rang so nay chia 3 du 2, cac chu so hang ngan,hang chuc, hang tram, hang don vi lan luot la la cac so tu nhien lien tiep tang dan va trong 4 chu so do khong co chu so nao bang 7
Tong cac chu so cua so tu nhien co 3 chu so la 12. Chu so hang chuc bang tong chu so hang tram va hang don vi. Neu doi vi tri chu so hang tram va hang don vi thi duoc so moi hon so cu la 396. Tim so ban dau.
(giải ra)
tim so tu nhien co 3 chu so biet rang chu so hang don vi chia chu so hang chuc duoc thuong la 3 du 1 chu so hang tram bang tong 2 so con lai
tim so co 3 chu so. Biet trung binh cong cua 3 chu so la 2 va chu so hang tram bang tong chu so hang chuc va hang don vi. Tim 3 chu so do ?