1. hinh vuong co do dai canh 6\(\sqrt{2}\) thi do dai duong cheo cua hinh vuong do la ?cm

2.cho 2 phan thuc Q=\(\frac{12x^2+20x+3}{6x^2+43x+7}\)va P=\(\frac{8x^2+36x+36}{x^2+10x+21}\)voi tat ca cac gia tri cua x de 2 phan thuc P vaQ xac dinh thi khi do \(\frac{Q}{P}\)= ?

3.cho phan thuc A=\(\frac{2x^2+5x+8}{x^2-x+56}\)tap hop cac gia tri cua x de phan tuc A ko xac dinh la

cho da thuc P(x)=\(x^3-ax^2-2x+2a\)

Xac dinh cac gia tri cua a de da thuc P(x) co 3 nghiem phan biet sao cho co 1 nghiem la trung binh cong cua 2 nghiem con lai

cho hinh binh hanh abcd (nhu hinh ve) co dien tich 24cm . chieu cao ah la 3cm va bang 1 phan 2 chieu cao ce . tinh chu vi cua hinh binh hanh do.

1 hinh thang co chieu cao la 10m hieu 2 day la 22m keo dai day nho = day lon de hinh da cho thanh hinh chu nhat co chieu dai = day lon chieu rong = duong cao hinh thang dien tich duoc mo rong them = 1/7 dien tich hinh thang cu 1 phan mo rong them co dien tich la 90m2 

Cho hinh thang can abcd co day bc,ad.Goi m,n,p,q theo thu tu la trung diem cua ab, bc,cd,da
a)cmr:MP la phan giac goc qmn 
b)tim dieu kien cua hinh thang abcd doi voi 2 duong cheo de goc mnq bang 45 do 
c)cmr:co them dieu kien do thi hinh thang can abcdco duong cao +duong trung binh cua no

cho hinh tam giac ABC deu co canh dai 6cm ,tren canh BC lay E sao cho BE=EC. BH la duong cao ha tu dinh B cua tam giac ABC va BH=3 cm .EH chia tam giac thanh 2 phan dien tich tu giac ABEH gap doi dien tich CEH 

a,tinh do dai doan thang  AH

b, tinh dien tich hinh tam giac AHE

1 một thửa ruổng hinh binh hanh co dien tich bang dien tich cua mot hinh chu nhat co chieu dai 32 cm chiêu  rong 2dm tinh chieu cao hinh binh hanh do biet do dai canh la 16 cm

2 hinh thoi abcd co dien tich 108cm2 tinh do dai cua duong cheo ac biet rang do dai duong cheo bang bd la 18 cm

                                    _{Mot hinh thang co chieu cao bang 10m hieu 2 day la 22m keo dai day nho bang day lon de hinh da cho thanh hinh chu nhat co chieu dai bang day lon chieu rong bang duong cao hinh thang dien tich duoc mo rong them 1/ 7 dien tich hinh thang cu phan mo rong them co dien tich la 90m2 tinh do dai day lon cua hinh thang ban dau}