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12 tháng 9 2015
Vì \(\left|x-y\right|\ge0;\left|y+\frac{9}{25}\right|\ge0\Rightarrow\left|x-y\right|+\left|y+\frac{9}{25}\right|\ge0\)
Mà \(\left|x-y\right|+\left|y+\frac{9}{25}\right|=0\)
\(\Rightarrow\left|x-y\right|=0;\left|y+\frac{9}{25}\right|=0\)
\(\left|y+\frac{9}{25}\right|=0\Rightarrow y=\frac{-9}{25}\)
\(\Rightarrow\left|x-y\right|=\left|x-\frac{-9}{25}\right|=0\Rightarrow x=\frac{-9}{25}\)
2 tháng 9 2015
Chia 3 TH của n: n=3k, n=3k+1, n=3k+2
TH1: n=3k suy ra 2n chi hết cho 3
111...1 có tổng các chữ số là n chia hết cho 3 => 111...1 chia hết cho 3
Vậy tổng chia hết cho 3
6 tháng 12 2015
Gọi số cần tìm là a ta có:
a-5:7
a-8:11
suy ra a-13:(5;7)
a -13 BCNN(5;7)
5=5
7=7
BCNN (5;7)=5.7=35
Số đó là:35+13=48
mk nhanh nhất ****
CT
5
27 tháng 11 2018
My favorite room in my house would be my room. It is the biggest in the house and I adore my room an I am always there in my room and never really get out. I love my room I get really distracted doing things because I am always there. I do a lot of things and it's very nice and beautiful.
My room is awesome I love how I have it all decorated I have hanging hearts in the ceiling. Also, I have the biggest bed ever and my blanket is of guitars because I love guitars and my curtains match the carpet too. I have a lot of makeup bags and nail polishes all over I have jewelry hanging and a lot of designs in my room. My walls are are full of posters an my walls are colorful.
I love my room and I have magazines a lot actually and bags hanging all over as much as shoes all over the place. I have a big closet and it's packed of so much clothes and purses as much as shoes. I have scarfs hanging in this colorful lamp and I have a flat screen tv. hanging in my wall and I love to watch movies and put music. Also I have three big radios because I have a lot of cd's and I love to put the music all loud.
****
Nguyễn Thi Hạnh
70 nha bạn,tick,cho mình