giup minh nha bài 1 tim x
1 \(\sqrt{x}=1\)
2) \(\sqrt{x}=3\)
3)\(\sqrt{x+1}=11\)
4)\(\sqrt{x-2}=12\)
5)\(\sqrt{2-3x}=9\)
6)\(\sqrt{3x+4}=5\)
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=2013.7645+(2013+1).2355-1355
=2013.7645+2013.2355+2355-1355
=2013.(7645+2355)+1000
=2013.10000+1000
=20130000+1000
=20131000
Question VI. Combine these sentences using given words Example: He does more exercise. He is putting on weight.(because) => He does more exercise because he is putting on weight 1. He stayed at home. He was sick. (because) =>……………………………………………………………………………………………….. 2. It was very cold. They went swimming. (but) =>……………………………………………………………………………………………….. 3. We can go camping. We can go for a picnic. (or) =>……………………………………………………………………………………………….. 4. He had a stomachache. He didn’t wash his hands. (so) =>………………………………………………………………………………………………… Question VI. Combine these sentences using given words Example: He does more exercise. He is putting on weight.(because) => He does more exercise because he is putting on weight 1. He stayed at home. He was sick. (because) =>……………………………………………………………………………………………….. 2. It was very cold. They went swimming. (but) =>……………………………………………………………………………………………….. 3. We can go camping. We can go for a picnic. (or) =>……………………………………………………………………………………………….. 4. He had a stomachache. He didn’t wash his hands. (so) =>…………………………………………………………………………………………………
Bài 5 :
Đánh dấu vào câu b
Bài 6 :
\(468\times135=63180\)
\(579\times254=147066\)
\(936\times205=191880\)
\(B=|2014-2x|+|2016-2x|\)
\(=|2014-2x|+|2x-2016|\ge|2014-2x+2x-2016|\)
Hay \(B\ge2\)
Dấu"="xảy ra \(\Leftrightarrow\left(2014-2x\right)\left(2x-2016\right)\ge0\)
\(\Leftrightarrow\hept{\begin{cases}2014-2x\ge0\\2x-2016\ge0\end{cases}}\)hoặc \(\hept{\begin{cases}2014-2x< 0\\2x-2016< 0\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}2x\le2014\\2x\ge2016\end{cases}\left(loai\right)}\)hoặc\(\hept{\begin{cases}2x>2014\\2x< 2016\end{cases}}\)
\(\Leftrightarrow\hept{\begin{cases}x>1007\\x< 1008\end{cases}}\)
\(\Leftrightarrow1007< x< 1008\)
Vậy \(B_{min}=2\)\(\Leftrightarrow1007< x< 1008\)
will be used in the future
ours
interested in this film
of energy will be developed
will be found to reduce pollution in our city
to stay up late watching football matches last year
to be some trees in the field
excited about this story
energy will be used in the future
interested in this exercise
1) Ta có: \(\sqrt{x}=1\)
\(\Leftrightarrow\left(\sqrt{x}\right)^2=1^2\)
\(\Leftrightarrow x=1\left(TM\right)\)
Vậy \(x=1\)
2) Ta có: \(\sqrt{x}=3\)
\(\Leftrightarrow\left(\sqrt{x}\right)^2=3^2\)
\(\Leftrightarrow x=9\)
Vậy \(x=9\)
3) Ta có: \(\sqrt{x+1}=11\)
\(\Leftrightarrow\left(\sqrt{x+1}\right)^2=11^2\)
\(\Leftrightarrow x=121\left(TM\right)\)
Vậy \(x=121\)
4) Ta có: \(\sqrt{x-2}=12\)
\(\Leftrightarrow\left(\sqrt{x-2}\right)^2=12^2\)
\(\Leftrightarrow x=144\left(TM\right)\)
Vậy \(x=144\)
5) Ta có: \(\sqrt{2-3x}=9\)
\(\Leftrightarrow\left(\sqrt{2-3x}\right)^2=9^2\)
\(\Leftrightarrow2-3x=81\)
\(\Leftrightarrow-3x=79\)
\(\Leftrightarrow x=-\frac{79}{3}\left(TM\right)\)
Vậy \(x=-\frac{79}{3}\)
6) Ta có: \(\sqrt{3x+4}=5\)
\(\Leftrightarrow\left(\sqrt{3x+4}\right)^2=5^2\)
\(\Leftrightarrow3x+4=25\)
\(\Leftrightarrow3x=21\)
\(\Leftrightarrow x=7\left(TM\right)\)
Vậy \(x=7\)
- Vì đề không cho \(x\in Z\)nên các giá trị ở các phần trên đều thỏa mãn hết các bạn nha ^_^