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tong binh phuong cua 3 so tu nhien la 2596.Biet rang ti so giua so thu nhat va so thu hai la 2/3,giua so thu hai va so thu 3 la 5/6.Timba so do
tong 3 so -84 Biet rang ti so giuaso thu nhat va so thu 2 =1/2 va ti so giua so thu 2 va 3 cung = 1/2 . tim cac so do
tong binh phuong cua 3 so tu nhien la 2596 . Biet rang tti so giua so thu nhat va so thu 2 la 2/3 , giua so thu 2 va so thu 3 la 5 / 6 . tim 3 so do
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.
cho 3 so co tong la 210, biet rang 6/7 so thu nhat bang 9/11 so thu hai va bang 2/3 so thu ba, tim so lon nhat trong ba so
Tim so co ba chu so biet rang so do vua chia het cho 5 vua chia het cho 9 va hieu giua hai so do voi so viet theo thu tu nguoc lai la 297
cho 2 phan so 4/4 va 6/7 tu 2 phan so da cho lap 1 phan so thu ba bang cach ;tu so la tong cac tu so cua 2 phan so da cho ,mau so la tong cac mau so da cho.Hay so sanh ba phan so do voi nhau va xep chung theo thu tu tang dan
Tong cua ba so la 122. Neu lay so thu nhat chia cho so thu hai hoac lay so thu hai chia cho so thu ba deu duoc thuong la 3 va du la 1. Tim ba so ay
trung binh cong cua 4 so la 99. Tim 4 so do, biet rang so thu nhat bot di 2, so thu hai them 2don vi, so thu ba chia cho 2, so thu 4 nhan voi 2 thi duoc 4 ket qua bang nhau