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nhi142
2 năm trước
Bài 1. Tìm x, biết. 2^(x-2)=32b)3^(x+3)=81c)4^x=8^6 〖d) 2〗^(2x+1)= 4^5.8^3 〖 e) 3〗^(x-3)=9^5.〖27〗^2g)5^(13-x)= 〖25〗^2.125 h) i) Bài 2. Tìm x, biết. (x – 1)3 = 27 b) ( 2x – 1)3 = 125 d) Bµi 3:Cho A = 1 + 2 + 22 + 23 + 24 + ... + 249 + 249 Chứng minh rằng: A + 1 là số chính phương. Giúp mị với
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