Đáp án:
3.5
Biến đổi về trái:
(a+b+c)^3
= (a+b)^3 + 3(a+b)^2.c + 3(a+b).c^2 + c^3
= a^3 + 3a^2b + 3ab^2 + b^3 + 3(a^2 + 2ab + b^2)c + 3ac^2 + 3bc^2 + c^3
= a^3 + b^3 + c^3 + 3ab(a+b) + 3ac(a+b) + 3bc(a+b) + 3c^2(a+b)
=a^3 + b^3 + c^3 + 3(a+b)(ab+ac+bc+c^2)
=a^3 + b^3 + c^3 + 3(a+b)[a(b+c) + c(b+c)]
=a^3 + b^3 + c^3 +3(a+b)(b+c)(a+c)
Giải thích các bước giải:
Tại sao lại nói Nguyên Hồng là nhà văn của phụ nữ và trẻ em
lap dan bai thuyet minh ve cai quat
Nếu a^2 + b^2 + c^2 = ab + bc + ca thì a = b = c
Ai giúp mình hoàn thành bảng này được không ạ?
Hướng dẫn làm bài văn thuyết minh đề : Cây lúa Việt Nam
We…………………..them on that day A. haven’t meet B. didn’t meet C. hadn’t met D. wouldn’t meet Câu này trả lời sao ạ
G=(2+√a /2-√a - 2-√a/2+√a -4a/a-4):(2/2-√a -√a +3/2√a-a) rut gon
1. A.bookshelf B.hello C.sister D.open 2. A.twenty B.classroom C. morning D. fifteen
Câu 1: If you don't finish your duty before deadline, you will be punished. A. Unless you finish your duty before deadline, you won't be finish. B. Unless you finish your duty before deadline, you will be punished. C. Since you don't finish your duty before deadline, you will be punished. D. Because you don't finish your duty before deadline, you will be punished. Câu 2: It is too difficult for them to solve the problem by themselves. A. Because the problem is very difficult, they can't solve it by themselves. B. Unless the problem is difficult, they can't solve it by themselves. C. They have no difficulty in solving the problem by themselves. D. It is quite easy for them to solve the problem by themselves. Câu 3: Unless you help me, I won't finish the work by deadline. A. Because you helped me, I finished the work by deadline. B. If you don't help me, I won't finish the work by deadline. C. If you don't help me, I will finish the work by deadline. D. Your help made me feel happy. Câu 4: It was such a bad day that we did nothing. A. If it is fine, we will do something. B. Because it was very bad, we did nothing. C. Because of a bad day, we will do nothing. D. Unless it was a bad day, we did nothing. Câu 5: She got lost because she was not careful. A. She got lost because of her carelessness. B. If she is careful, she will not get lost. C. She is so careless that she gets lost. D. So careless is she that she gets lost.
kể tên 5 cây trồng làm lương thực lâu năm,theo em những cây lương thực thường là cây một năm hay lâu năm
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