a) 735 - 431
= 732.73 - 428.43
= (74)8.343 - (44)14.64
= (...1)8.343 - (...6)14.64
= (...1).343 - (...6).64
= (...3) - (...4)
= (...9)
b) 21930.91945
= 21928.22.91944.9
= (24)482.4.(94)486.9
= (...6)482.4.(..1)486.9
= (...6).4.(...1).9
= (...6)
tim chu so tan cung cua cac so sau
6 mu 1995
9 mu 1995
3 mu 1995
2 mu 1995
1) chung to rang
a) 76 + 75 - 74 chia het cho 11
b )278 - 321 chia het cho 26
c) 812 - 2 33 - 230 chia het cho 55
2) tim chu so tan cung cua tong
30 mu 4 mu 1 mu 9 mu 9 mu 9 + 15 mu 5 mu 1 mu 9 mu 9 mu 9
Tim so tan cung 7 mu 35 - 4 mu 31
tim chu so tan cung cua 2 mu 2019 va 3 mu 2019
tim so tan cung cua 7 mu 4k+1,3 mu 4k+3,2022mu 2021 mu 2010
Tim chu so tan cung cua 2 mu 10993 ; 3 mu 16 nhan 5 ; 3 mu 1993 : giup minh voi minh dang can gap
Chung to 51 mu 51 bang 51 mu 3 tat ca mu 17 va tim 2 chu so tan cung cua moi so.có cách chung minh cang tot
tim chu so tan cung cua cac so sau
a . 57 mu 1999
b. 93 mu 1999
Tim 2 chu so tan cung cua 7*2015 (* la so mu nha cac ban)
