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\(=\lim\limits_{x\rightarrow0}\dfrac{\sqrt{4x+1}-\left(2x+1\right)+2x+1-\sqrt[3]{6x+1}}{x^2}\)
\(=\lim\limits_{x\rightarrow0}\dfrac{-\dfrac{4x^2}{\sqrt{4x+1}+2x+1}+\dfrac{x^2\left(8x+12\right)}{\left(2x+1\right)^2+\left(2x+1\right)\sqrt[3]{6x+1}+\sqrt[3]{\left(6x+1\right)^2}}}{x^2}\)
\(=\lim\limits_{x\rightarrow0}\left(-\dfrac{4}{\sqrt{4x+1}+2x+1}+\dfrac{8x+12}{\left(2x+1\right)^2+\left(2x+1\right)\sqrt[3]{6x+1}+\sqrt[3]{\left(6x+1\right)^2}}\right)\)
\(=\dfrac{-4}{1+1}+\dfrac{12}{1+1+1}=2\)
Câu hỏi ở dưới nha
\(=\lim\limits_{x\rightarrow-1}\dfrac{\dfrac{x+2017-\left(2015-x\right)}{\sqrt[3]{\left(x+2017\right)^2}+\sqrt[3]{\left(x+2017\right)\left(2015-x\right)}+\sqrt[3]{\left(2015-x\right)^2}}}{\dfrac{2000+x-\left(1998-x\right)}{\sqrt{2000+x}+\sqrt{1998-x}}}\)
\(=\lim\limits_{x\rightarrow-1}\dfrac{\sqrt{2000+x}+\sqrt{1998-x}}{\sqrt[3]{\left(x+2017\right)^2}+\sqrt[3]{\left(x+2017\right)\left(2015-x\right)}+\sqrt[3]{\left(2015-x\right)^2}}\)
\(=\dfrac{\sqrt{1999}+\sqrt{1999}}{\sqrt[3]{2016^2}+\sqrt[3]{2016^2}+\sqrt[3]{2016^2}}=\dfrac{2\sqrt{1999}}{3.24\sqrt[3]{294}}=\dfrac{\sqrt{1999}}{36\sqrt[3]{294}}\)
\(\Rightarrow a+b=1999+294\)
đọc câu hỏi ở phía dưới nha!
a) Đây là Diệu Chi, bạn mới của lớp ta.
b) Bạn Diệu Chi là học sinh cũ của Trường Tiểu học Thành Công.
c) Bạn ấy là một hoa sĩ nhỏ đấy.
a) Trần Quốc Khái quê ở huvện Thường Tín, tỉnh Hà Tây.
b) Ông học được nghề thêu ở Trung Quốc trong một lần đi sứ.
c) Để tưởng nhớ công lao của Trần Quốc Khái, nhân dân lập đền thờ ở quê hương ông.
last - was - at - such - postcards - with - returned - exciting
He was in Hanoi, the capital of Vietnam.
He stayed in Ha Noi for three weeks.
He visited a lot of interesting places such as Uncle Ho's Mausolium, Ba Dinh Square, West Lake, Lenin Park.
He bought some postcards and a cap with a national flag on it
a) Cây //xoà cành ôm cậu bé.
b) Em// học thuộc đoạn thơ.
c) Em// làm 3 bài tập toán .(ko gạch 2 gạch được nên mình tách ra nhé)
nằm ngay dưới chân núi Phú Sĩ hùng vĩ , bên bờ hồ Ta-nu-ki thơ mộng nhé
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Người ta có ý tốt giúp bạn mà bạn đùa giỡn mua vui ? Còn bảo tội bạn này tội bạn nọ, dơ thế nhở ?