B(504) la :504 ,1008 ,..
ma so lon = so be nhan 6 =>tong cua 2 so chia het cho 7 va hai so la so co 3 chu so
so be la :1008 ;7 =144
số lớn là 144.6 = 864
Tim hai so co ba chu so biet tong cua chung la boi cua 504 va thuong cua so lon chia cho so nho la boi cua 6.
Nghe bon " leo teo " don la thang Nguyen Khac Vinh ngu. De xem no giai bai nay the nao.
tong so hs 2 truong thcs la boi cua 498 va thuong la boi cua 5 biet so hs moi truong lon hon 100 va nho hon 1000 tinh so hs moi truong
tim 2 so co tong la 504 so uoc chung cua chung la 12 va so lon khong chia het cho so nho
Bai 4 : Tìm hai so biet rang tong cua chung gap 7 lan hieu cua chung, tich cua chung gap 48 lan hieu cua chung.
Bai 5 : Tim thuong cua mot phep chia, biet rang neu them 100 vao so bi chia va them 25 vao so chia thi thuong va so du khong thay doi.
Bai 6 : Mot phep chia co thuong la 6 , du 3. Hieu giua hai so chia va so bi chia la 38. Tim hai so
tim 2 so tu nhien a va b ,biet boi chung nho nhat cua a va b la 420 ;uoc chung lon nhat cua a va b la 21 ;a+21 =b
Biet rang : BCNN(a,b).UCLN(a,b)
a, BCNN cua hai so la 600, UCLN cua chung nho hon 10 lan BCNN. So thu 1 la 120, tim so thu 2.
b, UCLN cua hai so la 12, BCNN cua chung lon gap 6 lan UCLN . So t 1 la 24, tim so t 2
c, Tong cua hai so bang 60, tong giua UCLN va BCNN cua chung la 84. Tim hai so do.
Tim so co 4 chu so biet so do cong voi so co 2 chu so tao boi chu so hang nghìn ,tram va so co 2 chu so tao boi chu so hang chuc ,don vi cua so do tong la 7968
1. mot phep chia co tong cua so bi chia va so chia bang 72. biet rang thuong la 3 va so du la 8. tim so bi chia va so chia
2. TIm hai so tu nhioen .biet rang tich cua chung la 630 va neu them 4 don vi va mot thua so thi tich moi la 798
B1:tim hai so biet:
tong cua BCNN voi UCLN cua chung la 15
B2:tim so tu nhien nho nhat co 3 chu so chia cho 18,30,45;co so du lan luot la 8,20,35.
