tim so tu nhien co hai chu so .Biet rang tong cac chu so bang 6 va neu them vao so don vi thi duoc mot so cung viet bang cac chu so do nhung theo thu tu nguoc lai
hay he thong lai kien thuc cac goc da hoc goc o tam goc noi tiep bang 1 bang so sanh gom cac y sau dinh nghia hinh ve cung bi chan cach tinh so do goc
Mot nguoi ban my,lan 1 ban 1/2 so my va 1 o, lan 2 ban 1/2 so my con lai va mot o, lan 3 ban 1/2 so my con lai va 1 o,lan 4 ban 1 o thi vua het.Tinh so o my?
viet len bang 5 so 5, 20 s0 20 và 16 s0 16. moi so duoc viet boi mot trong ba mau xanh, do hoac vang.Gia tri trung binh cua tat ca cac so thay doi the nao neu 3 so 5 duoc thay doi boi 3 so 20 va 1 s0 20 duoc thay doi boi 1 so 16?
tim hai so biet rang tong cua chung la 18 neu tang moi so them hai don vi thi tich cua chung tang len 1,5 lan giai bai toan bang cach lap phuong trinh
Cac anh cac chi oi giup em voi, gap lam.Cho ham so y=x+1 co do thi la (d) va ham so y= -x+3 co do thi la (d' )
a) Ve (d) va (d' ) tren cung mot mat phang toa do
b) Hai duong thang (d) va (d' ) cat nhau tai C va cat truc Ox theo thu tu tai A va B tim toa do cac diem A,B,C (Tim toa do diem C bang phuong phap dai so)
c) tinh chu vi va dien tich tam giac ABC (voi don vi do tren cac truc toa do la cm)
d) tinh goc tao boi duong thang y=x+1 voi truc Ox
Cam on nhieu.
tim 5 so nguyen to. biet rang 1 trong 5 so do co gia tri bang tong 2 so nguyen to va bang hieu 2 so nguyen to con lai
tim 5 so nguyen to. biet rang 1 trong 5 so do co gia tri bang tong 2 so nguyen to va bang hieu 2 so nguyen to con lai.
1 bat giac loi co tat ca cac goc bang nhau ,do dai cac canh la cac so nguyen duong.chung minh cac canh doi cua bat giac do bang nhau