giai chi tiet giup to may bai nay nha
1. Cho tam giac ABC co trung tuyen AM . Goi I la trung diem cua AM. Tia BI cat AC tai D, qua M ke duong song song voi BD cat CD tai E. Biet BD=18cm , khih do ID = ? cm
2. gia tri lon nhat cua bieu thuc Q= 5-x2+2x2-4y2-4y
3 . gia tri cua x thoa man (12x-5)(4x-1)+(3x-7)(1-16x)=81 , x=?
4. x+y=3 , gia tri cua bieu thuc Q = x2+2xy+y2-4x-4y+1=?
5 . a+b+c=0 va abc=-2 thi a3+b3+c3= ?
6. rut gon bieu thuc(a2+b2)2-4a2b2voi a2-b2=5 ta duoc ket qua ?
giai chi tiet giup minh may bai nay nha . minh cam on nhiu
1. cho hinh thang can ABCD (AB song song CD) . ke duong cao AE cua hinh thang. Biet AB=15 cm, CD =26 cm. Do dai doan DE la ? cm
2.gia tri cua x3+y3-9x-54=0
3. tu 0 den 6 co the viet duoc bao nhieu chu so tu nhien co 2 chu so khac nhau
4. voi moi x, gia tri cua bieu thuc (x+1)3-(x+1)3+6(x+1)(x-1)
giup to 3 bai nay
1. gia tri cua x thoa man (2x+3)(x+1)2-(2x+3)(2x-3)
2. so nghiem cua da thuc x3+6x2+11x+6 la ?
3. bieu thuc C = 8-5x-2x2 dat gia tri lon nhat tai x = ?
giup to 3 bai nay
1. gia tri cua x thoa man (2x+3)(x+1)2-(2x+3)(2x-3)
2. so nghiem cua da thuc x3+6x2+11x+6 la ?
3. bieu thuc C = 8-5x-2x2 dat gia tri lon nhat tai x = ?
Giai ho minh bai nay minh cn ngay
Bai 1 cho tam giac ABC cac trung tuyen BM ,CM cat nhau tai G Goi P la diem doi xung voi M qua G goi Q la diem doi xung voi N qua G CM
a tu giac MNPQ la hinh gi vi sao
b neu tam giac ABC can tai A thi tu giac MNPQ la hinh gi vi sao
Bai 2 cho tam giac ABC M la diem bat ky tren BC Qua M ke duong thang song song voi AC cat AB tai D Qua M ke duong thang song song voi AB cat AC tai E goi I la trung diem cua AM Cm
a 3 diem D,E,Ithang hang
b khi M di chuyển trên BC thì I di chuyển trên đường nào
Bai 3 cho tam giac nhon ABC truc tam H va giao đường trung truc la diem O goi P,Q,N theo thu tu trung diem cua Ab,AH,AC CM
a tu giac OPQN la hinh binh hanh
btam giac ABC can co them dieu kien gi de tu giac OPQN la hinh chu nhat
1) Cho bieu thuc A=\(3+\frac{2}{x-1}\). Tinh gia tri cua bieu thuc A khi |2x-3|=1
2) Rut gon bieu thuc B=\(\frac{x}{x-1}\)-\(\frac{x-5}{x+1}\)-\(\frac{3-x}{1-x^2}\)
3) Tim cac gia tri nguyen cua x de bieu thuc \(\frac{B}{A}\)co gia tri nguyen duong
Cho tam giac ABC . Goi M la Trung diem cua BC , I la trung diem cua AM . Tia BI cat AC o D . Qua M ke duong thang song song vs BD cat AC o E . CMR :
a) AD = DE = EC
b) ED = 1/4 BD
( Bai duong trung binh cua tam giac)
tim gia tri nho nhat cua bieu thuc tim gia tri nho nhat cua bieu thuc x^4-4x^3+12x^2-16x+16
1.cho tam giac ABC vuong tai A,AC=4cm.Diem mthuoc BC.Goi D, E theo thu tu la chan cac duong vuong goc ke tu M den AB,AC. Chu vi cua tu giac ADME bang ?cm
2.Mot hinh chu nhat co chu vi =70 cm va S=300cm2. do dai duong cheo cua hinh chu do la =?
3.voi n∈N , gia tri cua bieu thuc (5n+2-3.5n+1+5n):5n la
1. cho x+y=7 va xy=8 gia tri cua bieu thuc x3+y3 = ?
2. gia tri lon nhat cua bieu thuc B= 1+3x-x2 la ?
