1/3+1/6+1/10+1/15+1/21+1/28
= (140+70+42+28+20+15)/420
= 315/420
= (315:105)/ (420:105)
=3/4
Trả lời: 3/4
1/3+1/6+1/10+1/15+1/21+1/28
= (140+70+42+28+20+15)/420
= 315/420
= (315:105)/ (420:105)
=3/4
Trả lời: 3/4
tinh nhanh 1+ 8+15+22+ .......... +281 hy vong cac ban se giup minh giai nha
tim 1 phan 2 ; 1 phan 3 ; 1 phan 5 ; 1 phan 6 ; 1 phan 10 ; 1 phan 12 cua 60
tim 15% ; 20%; 50%; 75% cua 60
tim cac so ma 60 chia het cho so do.
giúp mình nhanh nha mình đang cần gấp thank
tinh nhanh
A = 1/3 + 1/6 + 1/10 + 1/15 + 1/21 + 1/28
tim 1 phan 2 ; 1 phan 3 ; 1 phan 5 ; 1 phan 6 ; 1 phan 10 ; 1 phan 12 cua 60
tim 15% ; 20%; 50%; 75% cua 60
tim cac so ma 60 chia het cho so do.
bai 1 :
viet so thap phan lon nhat co 3 c/s khac nhau va tong cac c/s cua so do= 10
bai 2 :
co 50 nguoi tho du dinh xay xong 1 can phong trong 42 ngay . sau khi lam duoc 15 ngaythi co yeu cau phai hoan thanh can phong som hon 12 ngay nen co 1 so nguoi den them de cung lam . tinh so nguoi den them
Tính nhanh
a, S= \(\dfrac{1}{3}\) + \(\dfrac{1}{15}\) + \(\dfrac{1}{35}\) + \(\dfrac{1}{63}\) + \(\dfrac{1}{99}\) + \(\dfrac{1}{143}\)
b, A = \(\dfrac{1}{3}\) + \(\dfrac{1}{6}\) + \(\dfrac{1}{10}\) + \(\dfrac{1}{15}\) + \(\dfrac{1}{21}\) + \(\dfrac{1}{28}\)
c, H =\(\dfrac{4047991-2010x2009}{4050000-2011x2009}\)
d, T = \(\dfrac{2009x20010+2000}{2011x2010-2020}\)
e, P = \(\dfrac{7589-80,5x69,3}{7485,05-79x69,3}\)
f, B = 5,1 x 42,2 + 1,7 x 448 x 3 - 0,15 x 700
Giúp mình với
tinh nhanh:\(2000+\left(\frac{1}{15}+\frac{1}{35}+\frac{1}{63}+......+\frac{1}{9603}+\frac{1}{9999}\right)\)
cac ban giup toi,toi can gap
Tính nhanh (nếu được)
3 x 15 + 21 x 15 + 85 x 5
15 - 30 + 40
21 + 19 - 50 + 10
1/5 - 1/4 + 2
(1/4 +1/6) x (1/2 -1/4)
1/10 + 1/5 - 3/4
Trong ky thi Word Cup o vong loai co 32 doi tham gia, duoc chia thanh 8 bang , moi bang thi dau theo the thuc vong tron mot luot tinh diem , doi thang duoc 3 diem , doi thua ko duoc diem nao, hoa thi moi doi duoc 1 diem. Ket thuc, tong so diem cua 8 bang la 120 diem. Hoi co bao nhieu tran hoa ?
Cac ban giup minh nha