cho h la tap hop cac so tu nhien co hai chu so ma chu so hang chuc gap 3 lan chu so hang don vi phan tu nho nhat cua tap hop h la

so lon nhat co 2 chu so ma chu so hang chuc 

gap 3 lan chu so hang don vi la gi ?

Goi M  la tap hop cac so tu nhien co 2 chu so ma chu so hang chuc be hon 

chu so hang don vi la S .Phan tu lon nhat cua F.

viet bang cah liet ke cac phan tu cua cac tap hop sau:

a) tap hop A cac so tu nhien co 2chu so ma chu so hang chuc lon hon chu so 3 

b) tap hop B cac so tu nhien co 2 chu so ma chu so hang don vi gap doi hang chuc 

c) tap hop C cac so tu nhien co 2 chu so ma trong so do co it nhat 1 chu so 4 

tong cac chu so cua mot so co 2 chu so bang so tu nhien nho nhat co 2 chu so va chu so hang chuc gap 4 lan chu so hang don vi do la so nao ?

( ghi them loi giai )

1 so tu nhien A co 4 chu so co chu so hang don vi lon hon 3 lan chu so hang tram, chu so hang chuc gap 8 lan chu so hang nghin, biet A chia het cho 9. Tim A.

mot so tu nhien co hai chu so. Chu so hang don vi gap 2 lan chu so hang chuc. Neu them chu so 1 vao giua chu so ay thi duoc 1 so moi lon hon so ban dau la 370. Tim số ban đầu.

viet tap hop cac so tu nhien co hai chu so,trong do:

a,chu so hang don vi lon hon chu so hang chuc 4 don vi

b,chu so hang don vi gap 3 lan chu so hang chuc

c,chu so hang don vi nho hon chu so hang chuc va tong hai chu so =17

tim mot so tu nhien co 3 chu so ma chu so hang chuc bang 1/3 chu so hang tram va gap 3 lan chu so hang don vi