Hiệu 2 số lúc sau là: \(44,3+12,7+21,5=78,5\)
Hiệu 2 số lúc sau là: \(44,3+12,7+21,5=78,5\)
Tim so bi tru, biet hieu cua hai so bang so tru va so bi tru lon hon so tru la 26.
Dap an : ......................
cho phan so a/b khac 0, toi gian.biet rang neu cong ca tu so va mau so voi tu so cua phan so cua phân so da cho thi duoc phan so moi bang mot nua phan so da cho.khi do gia tri cua hieu a-b la..........................................
neu them vao so be 25% thi duoc so lon. hoi phai bot o so lon di bao nhieu phan tram thi duoc so be
tong hieu sau la so nguyen to hay hop so : 5.9.11-2.3.7
chung minh rang hieu cua 2 phan so toi gian la 1 so nguyen thi 2 phan so co mau bang nhau hoac doi nhau
Tong cua hai so la so co hai chu so giong nhau ma chu so hang chuc la 7,so hang thu nhat la 9.Vay so hang thu hai la bao nhieu
bac lan mua mot so qua trung gom trung ga va trung vit het tat ca 175000dong gia mot qua trung ga la 3000 dong va moi qua trung vit la 2500dong .Hoi bac lan da mua bao nhieu qua trung ga biet neu bac doi lai lay so trung ga lay so trung vit ban dau ma so trung vit bang so trung ga gia ban dau thi bac phai them 7500 dong
Co bao nhieu so la ;
a) Cac so chan co hai chu so.
b) Cac so le co hai chu so.
O hai cau hoi tren can phai ghi phep tinh ra tren tung cau hoi
cho B la so tu nhien . biet B = ax -by ; a;b la cac so nguyen to khac nhau ;x,y la hai so tu nhien khac 0 . B2 co 15 uoc hoi B3 co bao nhieu uoc