x / 15 = 8 / 24
24x = 8 x 15
24x = 120
x = 5
x - 1 / x + 5 = 6 / 7
7 ( x - 1 ) = 6 ( x + 5)
7x - 7 = 6x + 30
7x - 6x = 30 + 7
x = 37
3 / 1 - 2x = -5 / 3x - 2
3 ( 3x - 2 ) = - 5 ( 1 - 2x )
9x - 6 = -5 + 10 x
9x - 10x = -5 + 6
-x = 1
x = -1
Cac ban giai giup minh bai 4 trang 38 vo bai tap toan tap 2 lop 5 duoc ko ?Minh xin cac ban luon do
Bai 8: Mot to gom 15 nguoi, du dinh lam xong ngoi nha trong 20 ngay , nhung sau do to bo xung them 5 nguoi. Hoi ngoi nha do lam xong trong bao nhieu ngay?
cac ban oi
giup minh voi cac ban
ai lam duoc bai nay minh tich cho nhe
cam on cac ban rat nhieu
BAI 1 : Thuong 2 so bang 32 . Neu iam so chia di 8 don vi thi thuong moi se la 35,2 . Vay so bi chia la ............
Cac ban giai ra nha
Bai 2 : 1 so tu nhien co 2 chu so , neu bot di chu so hang tram cua so do thi duoc so moi . Neu lay so do chia so moi bang 5 du 2 . Vay co bao nhieu so thich hop voi so ban dau
giai ra nha
Tim x , biet : 5 < x < 6 va
a] x la so tu nhien
b] x la so thap phan co 1 chu so o phan thap phan
Cac ban oi , giai nhanh bai nay cho minh voi , mai minh da hoc roi . Ban nao giai nhanh va dung se duoc minh bam like nhieu . Cam on cac ban nhieu nhe
a.1/2+1/4+1/8+1/16+1/32
b.2/5+(2/8+3/5+6/8)
c.6/9+(24/15+12/9+6/15)
d.Bon,4/9-(hai,1/4+mot,4/9)
e.2006/2008*2001/2004*2008/2002*2004/2006*1001/2001
g.(1-1/2)*(1-1/3)*(1-1/4)*(1-1/5)*(1-1/6)
cac ban oi,hay giup minh giai bai nay nhe,cam on cac ban
1. Tinh cac tong sau :
A = 1 + 3 + 7 + ... + 101
M = 16 - 18 + 20 - 22 + 24 - 26 + ... + 64 - 66 + 68
H = ( 1 + 2 + 3 + ... + 99 ) x ( 13 x 15 - 12 x 15 - 15 )
G = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + 10 - 11 - 12 + 13 + 14 - ... + 301 + 302
2. Tim x biet :
a) 1 + 2 + 3 + 4 + ... + 99 + 100 + 2 x X = 5052
Ai giai duoc chi tiet cac bai nay minh tick lien 10 tick hi hi hi !!!!!!
tim 1 so biet lay so do co 2 chu so
neu lay so do chia cho tich cac chu so cua no thi ta duoc thuong la 5 du 2
bai nay co nhieu ket qua
cac ban nho viet loi giai nhe
Cac ban oi cho mk xem de thi violympic lop 5 vong 15 co duoc ko ?
1 bai cung duoc nhung kho kho nhe
cac ban oi ai ma giup minh tim duoc de thi violympic lop 5 vong 15 dung nhat thi minh se tick cho chu y la vong 15 phai co 3 bai la coc vang tai ba ;truy tim kho bau va bai trang giay nhe cac ban hay tim di vao luc 8 gio 30 toi mai minh se vao xem nhe mong moi nguoi giup do
