mik puồn huhu
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D
2
14 tháng 12 2021
GIÚP MIK VS NHA:(((((
CẢM ƠN RẤT NHIỀU
MN XONG CÂU NÀO THÌ CỨ GỬI LUÔN CHO MIK CÂU ĐÓ NHA;-;
MIK CÒN CHÉP KỊP
:(((((((((((((( NHANHH NHANH GIÚP MIK Ạ
14 tháng 12 2021
Câu 1:
\(a,\dfrac{x}{4}=\dfrac{y}{7}=\dfrac{x-y}{4-7}=\dfrac{-15}{-3}=5\\ \Rightarrow\left\{{}\begin{matrix}x=20\\y=35\end{matrix}\right.\\ b,\dfrac{x}{3}=\dfrac{y}{5}=\dfrac{x+y}{3+5}=\dfrac{-32}{8}=-4\\ \Rightarrow\left\{{}\begin{matrix}x=-12\\y=-20\end{matrix}\right.\\ c,\dfrac{x}{2}=\dfrac{y}{3}=\dfrac{z}{5}=\dfrac{x+y+z}{2+3+5}=\dfrac{-90}{10}=-9\\ \Rightarrow\left\{{}\begin{matrix}x=-18\\y=-27\\z=-45\end{matrix}\right.\\ d,\dfrac{x}{4}=\dfrac{y}{2}=\dfrac{z}{7}=\dfrac{2x-4y+3z}{8-8+21}=\dfrac{42}{21}=2\\ \Rightarrow\left\{{}\begin{matrix}x=8\\y=4\\z=14\end{matrix}\right.\)
\(e,\dfrac{x}{5}=\dfrac{y}{6}=\dfrac{z}{7}=\dfrac{z-x}{7-5}=\dfrac{30}{2}=15\\ \Rightarrow\left\{{}\begin{matrix}x=75\\y=90\\z=105\end{matrix}\right.\\ f,\Rightarrow\dfrac{x}{3}=\dfrac{y}{5};\dfrac{x}{4}=\dfrac{z}{3}\Rightarrow\dfrac{x}{12}=\dfrac{y}{20}=\dfrac{z}{9}=\dfrac{x-y-z}{12-20-9}=\dfrac{-68}{-17}=4\\ \Rightarrow\left\{{}\begin{matrix}x=48\\y=80\\z=36\end{matrix}\right.\\ g,\Rightarrow\dfrac{x}{6}=\dfrac{y}{4}=\dfrac{z}{3}=\dfrac{x+y+z}{6+4+3}=\dfrac{65}{13}=5\\ \Rightarrow\left\{{}\begin{matrix}x=30\\y=20\\z=15\end{matrix}\right.\\ h,\Rightarrow\dfrac{x}{4}=\dfrac{y}{6};\dfrac{y}{5}=\dfrac{z}{8}\Rightarrow\dfrac{x}{20}=\dfrac{y}{30}=\dfrac{z}{48}=\dfrac{5x-3y-3z}{100-90-144}=\dfrac{-536}{-134}=4\\ \Rightarrow\left\{{}\begin{matrix}x=80\\y=120\\z=192\end{matrix}\right.\)
giúp mik với ạ mik cần gấp chiều thi huhu
PA
3
19 tháng 5 2016
Hi. My name Mai. I'm in from Vietnam. In Vietnam, there are four season: spring, summer, fall and winter. In the spring it is often warm,sometimes it's rainy.In the summer it's hot and sunny.The weather is cool in the fall and in the winter it is cold and windy.I like hot weather because I can do many activities.When it's hot,I usually go swimming and eat ice cream.Sometimes I go walking with my sister.
DM
19 tháng 5 2016
--->>> Mùa thu
The autumn is the romantic season of the year. I just think that I like 4 seasons, each season has its own beauty. But, indeed, I really like autumn. This beautiful season may make you have the feeling of time. Hurry up, winter come....
In the autumn the cool winds start to blow in, and that is so refreshing. I love the crispness of autumn and the smells of apple cider on the stove and the final roses putting out everything they've got. I love seeing the birch trees turn gold and begin to drop their leaves on breezy days like golden snow fall. All of the above remind me the goodliness of the nature. Autumn is also the best season to go out and have fun
--->>> Mùa đông
A year has 4 seasons: spring, summer, autumn and winter. Maybe, winter is a special season with me. It would bring me sad mood or happy mood. There are sad mood when I was alone or happy mood when I sat aside fire with friend. Warm feeling were radiated fire and friendship when we sat to joke.
Atmosphere in winter has been tranquillity, not noisy in order to ponder upon past, present and consider plan future.Winter often become days of last year to days new year. At this time, I have been to sum up what I acquire achievement in year and what we need to strive next year ? We also see the snow drop down. That is excited feeling.
Like another person, I have some memories about winter season. That was a snow - man. It was built by friends and me. It was a good opportunity for me to familiarize with them. They were new friends when my family had just gone there.We took 2 days to accomplish snow - man that helped us to adhere futher friendship. Up to now, friendship between us still remain and develop.
---->>> Mùa xuân
I like spring most. I’m joyful and happy every new year coming. Maybe boisterous air of spring always bring full vitality feeling to everyone. Spring has tree in flower, bird in twitter, everyone in new clothes, everyhouse in new repaired. Tet is an important event of spring, it is an occasion to those who work far from their house/ country be able to get together in family. They forget the past diffcult things, the unlucky chance, and of course they are willing to send many wishes together. They always pray for health, work, happiness.
VT
2
22 tháng 12 2016
\(\left(2x+3\right)^2=25\)
\(\Rightarrow2x+3=5\) hoặc \(2x+3=-5\)
+) \(2x+3=5\Rightarrow2x=2\Rightarrow x=1\)
+) \(2x+3=-5\Rightarrow2x=-8\Rightarrow x=-4\)
Vậy \(x\in\left\{1;-4\right\}\)
22 tháng 12 2016
\(\left(2x+3\right)^2=25\)
\(\Rightarrow\left(2x+3\right)^2=5^2=\left(-5\right)^2\)
\(\Rightarrow2x+3=\pm5\)
* Với \(2x+3=5\)
\(2x=5-3\)
\(2x=2\)
\(x=2\div2\)
\(x=1\)
* Với \(2x+3=-5\)
\(2x=-5-3\)
\(2x=-8\)
\(x=-8\div2\)
\(x=-4\)
Vậy \(x\in\left\{1;-4\right\}\)
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