1 a, 3 va 1/5 - 2 va 1/6 + 1/5b, 5 va 12/13 - 2 va 15/26 + 1/26c, 7 va 1/12 + 1/12 - 6 va 1/4 2 tinh gia tri bieu thuc a, 3 va 2/9 - [1 va 5/8 + 1 va 2/9 ] - 3/8b, 4 va 2/5 - 1 va 3/7 - 1 va 4/7 + 1/5c, 1 va 9/12 - 5/4 - 1/23 tinh a, 6 nhan 7 nhan 8 nhan 9 nhan 1 tren 18 nhan 16 nhan 14 nhan 12 nhan 2b, 4 nhan 15 nhan 9 nhan 24 tren 3 nhan 12 nhan 8 nhan 5 4 rut gon cac phan so a, 96/150 ; 255/408 ; 630/224b, 1515/1717; 352352/470470; 200620062006/2005200520055 so sanh cac phan so a, 7/9 va...
Đọc tiếp
1 a, 3 va 1/5 - 2 va 1/6 + 1/5
b, 5 va 12/13 - 2 va 15/26 + 1/26
c, 7 va 1/12 + 1/12 - 6 va 1/4
2 tinh gia tri bieu thuc
a, 3 va 2/9 - [1 va 5/8 + 1 va 2/9 ] - 3/8
b, 4 va 2/5 - 1 va 3/7 - 1 va 4/7 + 1/5
c, 1 va 9/12 - 5/4 - 1/2
3 tinh
a, 6 nhan 7 nhan 8 nhan 9 nhan 1 tren 18 nhan 16 nhan 14 nhan 12 nhan 2
b, 4 nhan 15 nhan 9 nhan 24 tren 3 nhan 12 nhan 8 nhan 5
4 rut gon cac phan so
a, 96/150 ; 255/408 ; 630/224
b, 1515/1717; 352352/470470; 200620062006/200520052005
5 so sanh cac phan so
a, 7/9 va 9/7 ; b, 135/120 va 13/8; c, 3535/4848 va 5/8 ; d, 650650/480480 va 222222/144144
6, so sanh hai phan so
a, 2005/2006 va 2006/2007 ; b, 2008/2007 va 2007/2006
cac ban lam tung buoc nha
\(\dfrac{5}{6}\) =\(\dfrac{5\times38}{6\times38}\) = \(\dfrac{190}{228}\); \(\dfrac{63}{76}\) = \(\dfrac{63\times3}{76\times3}\) = \(\dfrac{189}{228}\); \(\dfrac{190}{228}>\dfrac{189}{228}\)
Vậy \(\dfrac{5}{6}\) > \(\dfrac{63}{76}\)