nguoi ta dang lat gach nen nha cua mot can phong hinh chu nhat co chieu dai 8m va chieu rong bang 1/2 chieu dai.ban huy noi rang chi can dung 88 vien gach hoa hinh vuong co canh 60cm thi co the lat kin nen nha.biet rang mach vua khong dang ke.em hay giai thich xem ban huy noi co dung khong
o mot nha maysan xuat do choi tre em nguoi ta dong vao 10 thung giong nhau.Moi thung dung 10 con bup be trong do co 9 thung dung bup be binh thoung va 1 thung dung bup be nang hon .Cac bup be thi trong rat giong nhau khong phan biet duoc ma nguoi ta lai quen danh dau thung dung cac bup be nang hon truoc khi dan nhan ,chi biet rang nhung con bup be binh thuong nang 500g con moi con bup be nang hon thi nang 501g.Hoi lam the nao de chi can 1 lan ma tim ra duoc thung dung bup be nang hon?
Mọt doan cong tac gom 80 nguoi trong do co 32 nu . Can phan chia doan thanh các to cong tac co so nguoi bang nhau. so nam, nu cua cac to deu bang nhau. Hoi co bao nhieu cach phan chia doan thanh cac to de moi to khong qua 10 nguoi?
cac ban giai cho mih toan lop 6.tap 1.luyen tap 2 cua bai ũc chung lon nnhat
mong cac ban lam nhanh
1,So nguyen a phai co dieu kien gi de ta co phan so
A, 15 / a -1
B, 2a / 5a +30
2, so nguyen a phai co dieu kien gi de ta co dong thoi cac phan so
C, 13 / a + 1
D, a+3 / a -2
E, 2a - 5/ 3a - 9
goi m la cac so co 9 chu so ma trong cach ghi cua no khong co so 0 so sanh m va 10 . 9^8
hs lop 6/2 khi xep hang 2, hang 3, hang 4, hang 8 dem thua mot nguoi nhung khi xep hang 7 thi vua du . tinh so hs lop 6/2 biet so hs ko qua 50 em
co ai biet ko chi minh voi
1, tim x thuoc Z de cho cac phan so sau la so nguyen
A, x+1 / 3
B, 17 / x -1
2, tim x thuoc Z de cho cac phan so sau dong thoi co gia tri nguyen
C, -12 / x
D, 15 / x -2
E, 8 / x +1
Cho A=1-2+3-4+...+19-20
a) A co chia het cho 2,3,5 khong
b) Tim cac uoc cua A