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 . Dien tich ANC la : 16 x 32 :2 = 2 56 (cm2) Dien tich ABN la : 384 – 2 56 = 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. 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. 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