Cho hình chóp S.ABCD có đáy ABCD là hình vuông và SA vuông góc với đáy. Góc giữa SB 0 và đáy bằng 60 . SA= 2a; Tính theo a thể tích khối chóp S.ABCD

Giúp em với ạ mai e phải nộp r 😿💔

VIII. Read the text carefully, statements are true (T), false (F), mentioned (NM). A. Put it on the bread, don't get burned My friend, Tom, had a little accident at home the other day. He was making a cup of tea when he spilled some boiling water on his arm. He didn't know what to do. He went to the fridge and found some butter. He puts this on the beggar. That is the wrong thing to do. Butter makes beggars worse. You should put a butt under cold running water. B. Going out wrong My cousin, Karen, has the flu. She felt very hot. At first, she lay in bed, but opened her bedroom window. She didn't feel any better, so she got up and went for a walk. She doesn't wear a coat or a scarf. At first she felt good in the cold air, but when she got home, she got really sick. Her temperature was over 40 ° C. Her mother called the doctor. The doctor told her to stay in bed for a week. C. Always Clean Cuts My brother, Mick, fell and cut his own throat on a broken old bottle in the local park. It's not a huge cut. He ties a handkerchief around his legs and then plays soccer with his friends. When he got home, he put mortar on it. He didn't wash it or put any antiseptic cream on it. The next day he removed the plaster. His legs look horrible. Mom took him to the doctor. The doctor cleaned the cut and put a bandage on Mick's leg. Now he can't play sports for a month. 66. Tom burned his arm. 67. He found some butter on the table. 68. Butter doesn't make his arms feel any better. 69. We should put a beggar under cold water. 70. Karen's bedroom is very hot. 71. Karen went for a walk because she felt better. 73. Mick doesn't worry when he cuts his own throat. 74. Don't have any antiseptic creams in the house. 75. Mick's legs are better now.

Bài 6: Cho a +b +c +d + e = 5m. Chứng minh: (2m –a)^2+ (2m – b)^2 + (2m – c)^2 + (2m – d)^2 + (2m – e)^2 = a^2 + b^2 + c^2 + d^2

mn ơi giúp em bài này với, em đang cần gấp cảm ơn nhiều

Làm đúng + đưa ra dẫn chứng vì sao chọn F/T nha:3

Giúp mình 1 câu này thui ạ. Thanh kiu vi na miu

movie là nước mĩ giùm , còn movie sang nước anh giùm gì

Bt1: cho tứ diện ABCD.gọi M,N lần lượt là trung điểm của AC và BC .trên đoạn BD lấy điểm P sao cho BP>PD. a)tìm giao tuyến của (BDM) và(ADN) .b)tìm giao tuyến của (ABD) và(MNP).c)tìm giao điểm của MP và(ADN). d)tìm thiết diện của hình chóp với mp (MNP)

Chứng minh biểu thức sau luôn âm −2𝑥^2+3𝑥−4