thung A chua mot luong dau nhieu gap 2 lan thung B. Neu chuyen 50 lit dau tu thung A qua thung B thi so lit dau cua thung B bang 2/3 so lit dau thung A
Phân tich da thuc thanh nhan tu :
X^2-2xy+y^2+2x-2y
Bài 2 : rút gon
X^3+2x2y+xy^2 phần ( k viết dau gach ngang dc)x^2-y^2
cho hinh vuong abcd co ac cat bd tai o.m la diem bat ki thuoc canh ad(m khac d,a).tia bm cat duong thang cd tai n,om cat an tai i.C/m di vuong goc voi an
phuong trinh \(m^2\left(mx+x-1\right)-m\left(x+5\right)=6-2x\) (tham so m) co tap nghiem la R . khi do m=....
a) x^2+4x+4=6*(x+2)
b)27^3-72x=0
giup mik nha moi nguoi
bai nay da lam minh nat oc bua gio roi
lam d hay sai minh cung tich dung cho nguoi giai dau tien
cam on moi nguoi
bai 7 : cho tam giac abc vuong tai a , duong trung tuyen am . goi d la trung diem cua ab , e la diem doi xung voi m qua d .
a ) chung minh e doi xung voi m qua ab .
b) cac tu giac aemc, aebm la hinh gi . chung minh .
c ) cho bc = 4 cm . tinh chu vi tu giac aebm.
d ) tam giac vuong abc can co them dieu kien gi de aebm la hinh vuong .
Trong mat phang chon 6 diem phan biet, trong do khong co 3 diem nao thang hang. voi 3 diem bat ki trong 6 diem do luon co 2 diem ma khoang cach nho hon 673. CMR trong 6 diem da cho luon tim duoc 3 diem la 3 dinh cua mot tam giac co chu vi nho hoc 2019
Tu giac ABCD co M la trung diem AD , N la trung diem BC . Chung minh : MN ≤ \(\dfrac{1}{2}( AB + CD )\)
bai 8 ; cho hinh chu nhat abcd . ke an,cm cung vuong goc voi bd .
a ) chung minh dn = bm .
b ) chung minh tu giac ancm la hinh binh hanh.
c) goi k la diem doi xung voi a qua n . tu giac dkcb la hinh gi . chung minh .
d ) tia am cat tia kc tai p . chung minh cac duong thang pn,ac,km dong quy .