kho..............wa...................troi................thi......................ret.....................ai..............tich...............ung.....................ho....................minh..................voi................ret............wa
Khong viet dau thi ai biet đc. CAI NIT
Mot cai san hinh chu nhat co chieu dai 12cm, rong 8cm. Nguoi ta dung cac vien gach vuong co canh 20cm de lat nen
a) Tinh so vien gach can dung
b) Neu moi met vuong gach co gia 95 nghin dong thi lat het cai san do het bao nhieu tien
co bao nhieu bien so xe khac nhau ma moi so xe lap boi 2 chu cai dung dau va 3 CS dung sau (bang chu cai co 25 CS) khong co bien 000
CO BA THAN LUN DI SIEU THI THANG THU 2 CAM CAI CHAY THANG THU 3 CAM CAI LY HOI THANG THUNHAT CAM CAI GI
goi m la giao diem cua hai duong thang mx-y=5 va 3x+my=6 co bao nhieu gia tri m thuc Z
o 2 ban la hai cai cay o giua co treo 1 cai vong co 1 ong cu dang nam o duoi co 1 cai gieng hoi ong cu bi j
co 24 con chuot di qua cong.hoi co bao nhin cai tai
nha minh co mot cai dien thoai.bo minh dung het 30% pin.me dung het 15%. con minh dung het 2/5 cua me+2/3% cua bo. dien thoai con 57%. hoi lam the nao de moi nguoi vua dung duoc dien thoai khi chi con3% pin
cho tam giac ABC, duoang cao AK .goi 3diem D,E,F lan luot la trung diem cua AB,AC,BC
a) BDEF la hinh gi ? vi sao
b) chung minh ADEF la hinh thang can
c) goi H la truc tam cua tam giac ABC.M,N,P theo thu tu la trung diem cua HA ,HB,HC.chung minh cac doan thang MF ,NE,PD bang nhau va cat nhau tai trung diem moi doan
BAI 2 cho tam giac ABC co AB=6,AC=8,BC=10.goi AM la trung tuyen cua tam giac
a)tinh AM
b)ke MD vuong goc voi AB,ME vuong goc voi AC.tu giac ADME co dang dac biet nao ?
c)DECB co dang dac biet nao
