Đáp án + giải thích các bước giải:
a) `y=f(x_0)=\sqrt{5}/2-\sqrt{(\sqrt{5})^2-1}+2=\sqrt{5}/2 - \sqrt{5-1}+2 =\sqrt{5}/2-2+2=\sqrt{5}/2`
b) Sai đề vì nếu `x_0=1/4` thì `\sqrt{x^2-1}=\sqrt{(1/4)^2-1}=\sqrt{1/16-1}=\sqrt{-15/16}` (vô lý)
Đáp án+Giải thích các bước giải:
$đk:x^2-1\ge0\\\to x^2\ge 1$
$a)x_o=\sqrt5\\\to y=\dfrac{\sqrt5}{2}-\sqrt{5-1}+2\\=\dfrac{\sqrt5}{2}-2+2=\dfrac{\sqrt5}{2}\\x_o=\dfrac14\\\to x_o^2=\dfrac{1}{16}<1\to$ hàm số không xác định.
a(b^2+c^2-a^2)+b(c^2+a^2-b^2) phân tích thành nhân tử nha
căn bậc hai(x) - căn bậc hai(x-1) - căn bậc hai(x-4) + căn bậc hai(x+9) = 0
giúp vssssssssssssssssssssssssssssssssssss cần gấp
Phân hệ giao cảm có tác dụng sinh lý nào
Viết 3 câu phục vụ cho vấn đề nghị luận về sự tự tin về Vũ Khoan.
Describe any activities in _______ you participated for your community. A Who B which C whom D that Giải thích kĩ hộ em nha :)
Bảo em bài này với ạ nhưng mà phải vẽ cả hình nữa
Đề 1: Sau khi học xong văn bản "Bài học đường đời đầu tiên" của Tô Hoài, em hãy viết đoạn văn (6 đến 8 câu) nêu cảm nhận của em về nhân vật Dế Mèn, trong đó có sử dụng một câu văn có hình ảnh nhân hóa hoặc so sánh, gạch chân dướ câu văn đó. Giúp tui ik mà
III. Every year many people in the world learn English. Some of them are young children. (1) _____ are teenagers. Many are adults. Some learn at school, and some learn in evening classes. A few learn English by (2) _____ or just by (3) _____ to the language on television or among their friends. Most people must work hard to learn English. (4) _____ do all these people want to learn English? It is difficult to answer that question. Young children learn English at school to study better at their subject. Many adults learn English because (5) _____ useful for their work. Teenagers often learn English for their (6) _____ studies, because some of their books are written (7) _____ English at their college or university. Other people learn English because they want to read English newspaper or magazine for (8) _____ and entertainment. IV. One of the main sources for the spreading of news and events throughout the world (1) _____ the newspaper. The purpose of newspapers is (2) _____ inform the public of political, social economic and entertainment happenings, among other things. Generally, there are three types of (3) _____: daily newspapers, weekly newspapers, and special-interest newspapers. Daily newspapers (4) _____ at least one edition every weekday. Most dailies also have a weekend (5) _____ Daily newspapers often have sections for news, sports, arts and entertainment, business and classified advertising. Weekly newspapers print once a (6) _____ and cover news of interest to readers in a smaller area than that of a daily paper. They focus (7) _____ local happenings rather than national or international events. Special-interest newspapers may publish daily, (8) _____, monthly, or even less frequently. They generally disseminate news of interest to a particular group of readers or feature news about a specific topic. Thanks to the (9) _____ of the Internet, we can now get access to electronic newspapers. To some extent, e-newspapers are cheap, up-to-date, and convenient for most (10) _____ in the world.
Rút gọn: (3^2+1)(3^4+1)(3^8+1)(3^16+1) mik cần gấp ạ!!!
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