Hai duong thang xy va zt cat nhau tai O , biet goc XOT= 4 lan goc XOZ . Tinh cac goc con lai  : Bai 1

ve goc xay = 50 do . Ve goc x'Ay' doi dinh xAy

a) Tinh cac goc con lai

b)Ve At la tia phan giac cua goc xAy , At' la tia doi cua At . Chung to At' la tia phan giac cua x'Ay

c) Viet ten cac goc doi dinh : Bai 2

Cho goc bet AOB . Tren cung mot nua mat phang bo AB , ta ve 2 tia OC va OD sao cho AOC =BOD=160 do

a) so sanh goc BOC va AOD

b) goc OE la tia doi cua tia OD . Tia OB co la co phai la tia phan giac cua COE k ? Vi sao ?

Giup minh nha thanks giup de co qua

1.ba nha kinh doanh hun von theo ti le 2:3:4tinh so tien lai moi nguoi bik so tien lai dc chia theo ti le hun von tong so tien lai 180 trieu dong

2.bik cu 100kg thoc thi cho 60 kg gao. Hoi 20 bao thoc moi bao nang 60 kg thi cho bn kg gao ??

3.de dao con muong can 30 nguoi lm trog 8 h . neu tang them 10 thoi gian giam dc may h? (nang suat =nhau)

4. 2 xe o to tu A den B. van toc xe I la 60km/h. Van toc xe thu 2 la 40km/h. thoi gian xe I di it hon xe2 la 30 phut. Tinh thoi gian moi xe di tu A den B va chieu dai quang duong AB ?

5.ba doi may cay lm viec tren 3 canh dong co DT = nhau. Doi I hoan thanh cong viec trong 4 ngay, doi 2 trong 6 ngay , doi 3 trong 8 ngay. hoi moi doi co bn may( co cung nang suat)bik rang doi I nhieu hon doi 2 la 2 may?

6. cho ham so y=-2x

a. bik diem A(3:yo)thuoc dthi ham so y=-2x. tinh y mu 0

b. diemB(1,15:3) va C(1,5;-3) co thuoc dthi ham so y=-2x hay ko???

c.e do thi ham so y=-2x

do cac ban nha tim tap hop nguyen a;b thoa man :a.b=3.(b-a)

neu ai lam duoc minh cho nich thoi loan vip nha 11 hoac nick bang bang vip co ca quan cong va kaka shi lever 5

va minh se cho nick kiem vu cung hoi vip thoi nhe rat hot .................................................................................

.................................................co len .......................................................................................co len................

.........................co len..............................................co len.................................HOT NHAT/