mot manh dat hinh chu nhat duoc chia thanh 4 hinh chu nhat nho hon co dien tich duoc ghi nhu hinh ve.Hoi hinh chu nhat con lai co dien tich la bao nhieu?
8m2 | 24m2 |
16m2 | ? |
mieng dat hinh vuong nguoi ta mo rong mot chieu 10 m thanh hinh chu nhat co S lon hon Shinh vuong cu la 380m2 hay thinh P va S cua ,mieng dat hinh vuong do
tim chu vi cua 1 hinh chu nhat biet rang ti so giua 2 canh la 2/5 va dien tich hinh chu nhat la 40 m2
cho hinh chu nhat ABCD. Diem M nam tren canh AB sao cho MB=1/2AB.Doan MC cat duong cheo BD tai O.Dien tich tam giac MBC băng 9cm2.Tinh dien tich tam giac MOB
Hoi phai dung tat ca bao nhhieu hinh lap phuong nho canh 1 cm de xep thanh mot khoi hinh hop chu nhat dai 1,6 dm ,rong 1,4 dm ,cao 9cm.Tra loi : so khoi lap phuong nho dung de la .......khoi
Tong cua hai so la so co hai chu so giong nhau ma chu so hang chuc la 7,so hang thu nhat la 9.Vay so hang thu hai la bao nhieu
cho a la so lon nhat co n chu so b la so nho nhat co n+1 chu so thi
1.goi A la tap hop cac so tu nhien co 2 chu so chia het cho 5 .Tong cac phan tu la:
2Gia tri nho nhat cua bieu thuc A=(x^2+2)^2 lacho tam giac abc co canh ac = 34 cm neu keo dai ac them 6 cm thi dien tich tam giac abc se tang 8 cm . tinh dien tich tam giac abc