nhung bai toan 6 nang cao

Bai 1:

Cho tam giac ABC Vuong o A co canh AB = 24cm, AC = 32cm. Diem M
nam tren AC. Tu M ke duong song song voi AB cat BC tai N .MN = 16
cm Tinh MN
Bai lam
C

32cm
M N
A K B
24cm
Noi A voi N . Ke NK vuong goc voi AB
- Vi MN song song AB va AB vuong goc AC nen MN vuong gac AC
Do do ABNM la hinh thang vuong nen MA=NK Ta co:
Dien tich ABC la : 24 x 32 :2 = 384 (cm2)
Dien tich ANC la : 16 x 32 :2 = 256 (cm2)
Dien tich ABN la : 384 – 256 = 128 (cm2)
TRong tam giac ABN co AK la: 138 x 2 :24 = 10 2/3
AK = MN nen MN = 10 2/3
DS: MN = 10 2/3
Bai 2
Ba nguoi cung lam 1 cong viec. Nguoi 1 hoan thanh 3 tuan , nguoi 2 hoan
thanh 1 cong viec nhieu 3 lan cong viec do trong 8 tuan. Nguoi 3 co the hoan
thanh 1 cong viec gap 5 lan trong 12 tuan . Neu 3 nguoi cung lam mot cong
viec ban dau hoan thanh trong may gio, neu moi tuan lam 45 gio?
Bai lam
Ba tuan lam so gio la: 3 x 45 = 135 gio
Nguoi 2 lam cong viec het so gio la: 135 :3 = 45 gio
Nguoi 3 lam cong viec het so gio la: 135 :5 = 27 gio
Neu 3 nguoi lam cong viec ban dau het so gio la: (135 + 45 + 27) = 69 gio

DS: 69 gio
Bai 3
Hai voi cung chay mot be het 1 gio 12 phut.Voi 1 chay mot minh thi 4 gio
se xong. hoi voi 2 chay may gio thi xong
Bai 5
Luc dau so trung ga bang so trung vit. Sau khi ban 80 qua trung
ga va 70 qua trung vit thi so trung ga con lai bang 48% tong so
trung con lai. Hoi moi loai con bao nhieu qua ?
Bai lam

Neu cung ban 70 qua trung ga va 70 qua trung vit thi so trung
ga con lai bang so trung vit con lai, moi loai =50% so trung con
lai

Nhung da ban 80 trung ga va 70 qua trung vit nen so trung ga
con lai bang 48% tong so, so trung vit con lai bang 52% tong so
Vay 10 qua trung vit tuong ung voi: 52 - 48 = 4% tong so

Tong so trung con lai la: 10 : 4 x 100= 250 (qua)
So trung con lai la : 250 x 48 :100= 120 (qua)
So trung vit con lai la : 250 – 120 = 130 (qua)
DS :ga 120 qua
Vit 130 qua
Bai 6
Bai tap tieng anh
Put the verbs into Present Simple or Present continuons tenes
1. The milk (smell) sour. You (keep) milk for a long time?
2. What your mother (do) in the evening?
She usually (watch) TV, somelimes she ( read ) books.
3. The can’t (go) out because it (rani ). He (not have) a rain coat.

4. The last train (leave) the station at 11.30 am
5. Peter ojten (speal ). So puicbly that mary ( not understand )
6. Ann (make) a dress your her sely now. She usually (make) her oun clothes
7. It (be) very cold today. You should ( wear ) uarm coat
8. He can’t (have) the book now because her jriend (read) it