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3 tháng 7 2016
=2013.7645+(2013+1).2355-1355
=2013.7645+2013.2355+2355-1355
=2013.(7645+2355)+1000
=2013.10000+1000
=20130000+1000
=20131000
giúp mình nhá
DN
5 tháng 11 2021
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) =>…………………………………………………………………………………………………
9 tháng 12 2021
Bài 5 :
Đánh dấu vào câu b
Bài 6 :
\(468\times135=63180\)
\(579\times254=147066\)
\(936\times205=191880\)
TT
0
8 tháng 11 2019
\(B=|2014-2x|+|2016-2x|\)
\(=|2014-2x|+|2x-2016|\ge|2014-2x+2x-2016|\)
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 \(B_{min}=2\)\(\Leftrightarrow1007< x< 1008\)
giúp mình với nhá
KY
11 tháng 4 2022
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
a) Delta = 4m^2 - 4(2m -1)
= 4m^2 -8m + 4
= (2m)^2 - 2.2m.2 + 2^2
= (2m-2)^2
Delta luôn lớn hơn hoặc bằng 0 với mọi m do đó phương trình luôn có nghiệm với mọi m
b) x1, x2 là nghiệm khi đó ta có x1+x2 = 2m, x1x2 =2m-1
A = x1^2 + x2^2 - 2x1x2
= (x1+x2)^2 - 4x1x2
= (2m)^2 -4(2m-1)
= (2m-2)^2
Ta thấy A nhỏ nhất khi 2m-2 =0 => m= 1