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 2 chu so biet rang chu so hang chuc lon hon chu so hang don vi la 2 va so do lon hon tong cac binh phuong cac chu so cua no la 1.

So chan la so tu nhien co chu so tan cung la 0;2;4;6;8 ; so le la so tu nhien co chu so tan cung la 1;3;5;7;9;.Hai so chan ( hoac so le ) thi

hon kem nhau 2 don vi a)viet tap C cac chang nho hon 10.b) viet tap hop L cac so le lon hon 10 nhung nho hon 20.c)viet tap hop A ba chu so chan lien tiep  trong do so nho nhat la 18.d)viet tap hop B bon so le lien tiep, trong do so lon nhat la 31

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

So cac so thap phan co 3 chu so phan thap phan ma cac so do lon hon 10 va nho hon 11 la

tong cac chu so cua 1 so co 2 chu so neu doi vi tri cua 2 chu so ta co so lon hon so can tim la 27

mot so co hai chu so biet tong cac chu so cua no la 8 hieu cac chu so cua cua no la 4 va chu so hang chuc lon hon hang don vi so do la so nao

CAC SO CO BA CHU SO LON HON 868 ?

tap hop cac so nguyen to co 2 chu so lon hon 51 co so phan tu la