HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
1. Ý d
2. Ý f
3. Ý b
4. Ý d
5. Ý c
6. Ý c
7. Ý d
8. Ý c
9. Ý c
10 . Ý d
11 . Ý d
bn xem giùm mình nha
Các phim hoạt hình
At twenty-five past nine, the bell rings and all the students do into the yard. It is time for recess. They are all happy and excited. They meet their friends and have some fun. Many are talking about the last class, or last night's movie. Som are eating and drinking as well as chatting. Some students are playing gameslike blindman's bluff or catch. Some boys are playing marbles and some girls are skipping rope. But the most popular activity is talking. The yard is very noisy until the bell rings. Then everyone goes indoors and classes begin again.Yeserday, my school is very fun. Many students met their friends. It's so cool. I'm played basketbaal. I love it. It's very graet. and I love my school so much.
sb:(98-48):2=25
sl:98-25=73
mik trả lời câu trên rùi nha
A B I H M N C a)
SABC = ( AH x BC ) : 2
= ( 14,5 x 9,2 ) : 2
= 66,7 ( cm2 )
b)
Ta có : SABN = \(\frac{1}{2}\) SABC ( Vì có đáy AN = \(\frac{1}{2}\) đáy AC
và có chung chiều cao hạ từ B xuống AC . )
SAMC = \(\frac{1}{2}\) SABC ( Vì có đáy MC = \(\frac{1}{2}\) đáy BC
và có chung chiều cao hạ từ A xuống BC . )
Ta thấy : Hai tam giác ABN và AMC cùng chứa tam giác AIN , nên :
SABN + SAMC = 2 x SAIN + SABI + SMINC +
= \(\frac{1}{2}\) SABC + \(\frac{1}{2}\) SABC
= SABC . ( 1 )
Ta đã có :
SABC = SAIN + SABI + SMINC + SBIM ( 2 )
Từ ( 1 ) và ( 2 )
=> SAIN = SBIM .