1. Due to the development in the science and technology, impossible things have become possible (develop)
2. Robots increase worker.safety... by preventing accident since humans are not performing..risky .jobs.(safe-risk)
3.As a..scientist (science), Professor Tran Dai Nghia set an example as a true...researcher..(research) who devoted himself to the...scientific..(science)career.

4. Robots save worker from performing..dangerous...tasks.(danger)

5.One disadvantage of robots is its high cost for the..production...(produce).
6.Robots are being used in both ..industrial.. manufacturing and the..medical..field.(industry-medicine)
7.There is no..technological.. reason why Japan will not be able to make progress in robotics.(technology)
8.The key to youtube's success is the...ability... for anyone from any where in the world to broadcast themselves for free(able)

Tổng quát: \(\frac{1}{x\left(x+1\right)}=\frac{1}{x}-\frac{1}{x+1}\) với mọi số tự nhiên x khác 0

\(\frac{1}{x\left(x+1\right)}+\frac{1}{\left(x+1\right)\left(x+2\right)}+\frac{1}{\left(x+2\right)\left(x+3\right)}=4\)

\(\Leftrightarrow\frac{1}{x}-\frac{1}{x+1}+\frac{1}{x+1}-\frac{1}{x+2}+\frac{1}{x+2}-\frac{1}{x+3}=4\)

\(\Leftrightarrow\frac{1}{x}-\frac{1}{x+3}=4\Leftrightarrow\frac{x+3-x}{x\left(x+3\right)}=4\Leftrightarrow\frac{3}{x\left(x+3\right)}=4\)

<=>4.[x(x+3)]=3<=>4.(x²+3x)=3

<=>4x²+12x=3

<=>4x²+12x-3=0

.....

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Chuyển câu trực tiếp sang gián tiếp (dạng Yes/no)

1.''These old buildings might have already disappeared by the time I am back next year?''he said

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2. Alfred said to John,''I didn't use your cassette player! Someone else did, not me.''

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3. Father said,''I was the superintendent while this school was being built.''

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4. The woman said,''If I had a gas stove, it would save me a lot of time.''

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I were born in 2004

1 đơn vị

Bài này là toán lớp 6 chứ nhỉ?

\(\frac{5}{2}X\frac{2}{3}=\frac{5X2}{2X3}=\frac{10}{6}=\frac{10:2}{6:2}=\frac{5}{3}\)