1.viet so tu nhien nho nhat co tong cac chu so bang 38?
2.mot phep chia hai so tu nhien co thuong la 6 va so du la 33.tim so bi chia,so chia,biet rang tong cua so bi chia,so chia,thuong va so du bang 695.
3.trung binh cong cua 3 so le lien tiep bang 299.tim so lon nhat trong 3 so do?
4.cho phan so a/b.rut gon so phan so a/b ta duoc phan so 5/7.neu them 71 don vi vao tu so va giu nguyen mau so,ta duoc phan so co gia tri bang 18/11.tim phan so a/b?
5.tim y biet:a=(2/11*13+2/13*5+2/15*17+2/17*19+2/19*21)*462-y=19
cac ban giai chi tiet gium minh nhe,ban nao giai duoc minh cho ***** lun
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
tu 6 chu so 1,2,3,4,6,8 co the lap duoc bao nhieu cap phan so = nhau co tong = 1 . (moi chu so chi duoc dung 1 lan trong tung cap phan so ) trinh bay ra minh LIKE VA KET BAN !!!!!!!!!!!
Cho phan so a/b co gia tri bang 3/4 neu giam mau so di 12 don vi va giu nguyen tu so thi duoc phan so moi co gia tri bang 6/7 tim gia tri cua phan so a/b
cho a/b bang 4/5 neu cong them 33 vao tu so va giu nguyen mau son thi duoc phan so moi la 25/41
ai nhanh minh tick
minh can gap chieu nay nop roi xin cac ban giup minh
cho 2 phan so 4/5 va 1/6 .hay tim phan so a/b sao cho khi them a/b vao 1/6 va bot a/b o 4/5 thi ta duoc 2 phan so co ty so la 2
cho 2 phan so 5/8 va 4/5.hay tim phan so a/b sao cho khi dem phan so 5/8cong voi phan so a/b va dem phan so a/b tru di phan so a/b thi duoc hai phan so co thuong la 2 ?
cho hai phan so 5/8 va 4/5 hay tim phan so a/b sao cho khi dem phan so 5/8 +voi phan so a/b va dem phan so 4/5-di phan so a/b thi ta duoc 2 phan so co ti so la 2
cho 2 phan so 7/11 va 1/5.hay tim phan so a/b sao cho cong vao moi phan so a/b thi co ti so la 3 ?
cho 2 phan so a/b va c/d co a/b - c/d=1/15 va a/b :c/d = 6/5. tim phan so a/b va c/d