\(a,=3x^2-12x-4x^2+2x=-x^2-10x\\ b,=2x^2-4x-3x+6+6-x=2x^2-8x+12\\ c,=\left(x-4-x\right)\left(x-4+x\right)=-4\left(2x-4\right)=16-8x\\ d,=4x^2+4x+1-4x+2=4x^2+3\\ e,=x^2-49-x^2+2x=2x-49\\ f,=x^3+6x^2+12x+8-x^3??x^2=???\\ g,=27-27a+9a^2-a^3+a^3-4=23-27a+9a^2\)
BAI 1
Cho tam giac ABC co BC = 8cm,cac trung tuyen BD , CE .Goi M , N theo thu tu la trung diem cua BE va CD .Goi giao diem cua MN voi BD,CE theo thu tu la I,K
a,Tinh do dai MN
b, CMR;MI = IK = KN
BAI 2
Cho hinh thang ABCD(AB//CD). Cac duong fan giac cua cac goc ngoai tai dinh A va D cat nhau tai M.Cac duong fan giac cua cac goc ngoai tai dinh B va C cat nhau tai N
a,CMR ;MN//CD
b,Tinh chu vi hinh thang ABCD biet MN =4cm
NHO CAC BAN GIUP VOI NHA
giup minh cau nay nhe
tim gia tri nho nhat cua bieu thuc A= 4x(2x+1) - 2(2x-3)2
tin a,b,c de f(x)=a3+bx+c chia het cho x+2 con khi chia x2-1 thi du x+5(nho cac ban va thay co giai giup)
cho hinh thang can abc day nho ab = bc dg cheo ac vuong goc ad
a) tinh cac goc hinh thang can
b) cm cd = 2ab
Giup minh vs
tim gia tri nho nhat va lon nhat cua A=x+y+1 biet x^2 +2xy +7(x+y)+2y^2+10
ai giup minh vs mai nop roi Thank thank ^-^<3
Chung minh dang thuc (a + b)^2 = (- a - b)^2 Mn giup e
tim giá trị nho nhât
a) x^2-4x+5
b)x^2+y^2-8x+4y+2016
c) x^2+y^2-xy-x+y+1
GIUP MIK VS NHA
CAN GAP
Tim x: 3(x-1)^2 - 3x(x-5)=1 mn giup e voi a <3
Tim gia tri nho nhat cua cac bieu thuc sau
a) A=|5x+2|+2015
b) B=2016-|4-3x|
c) C=|x-4|+|x-3|
giup minh giai cac gia tri nay voi...dung minh se tich
HỨA SẼ TÍCH...
