cho tam giác ABC có AB=9 cm;AC=12 cm ;BC=15 cm . Gọi M,N lần lượt là trung điểm của AC,BC A) chứng minh tam giác ABC là tam giác vuông . Tính MN
b) chứng minh MN=KQ,MN//KQ
c) vẽ AH vuông MB(H thuộc MB). Gọi K là trung điểm HB và Q là trung điểm AH.Chứng minh Q là trục tâm của tam giác AMK và CH vuông AK
mng làm nhanh giúp mik cần gấp ạ
change each sentence to direct speech
1.she said that she was leaving at six-she said
2.he said peter often went fishing-he said
3.she said she would be back later-she said
4.I said that I had just seen mark-i said
5.alan said that they had left at 6.00- alan said
6.helen said that she was working -helen said
7.i said that we were late-i said
8.he said he would phone back-he said
9.david said that he felt all right-david said
10. she said she love ice cream -she said
change each sentence to direct speech 1.she said that she was leaving at six
2.he said peter often went fishing
3.she said she would be back later
4.I said that I had just seen mark
5.alan said that they had left at 6.00
6.helen said that she was working
7.i said that we were late
8.he said he would phone back
9.david said that he felt all right
10. she said she love ice cream
