(x-1)(y-7)=7
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\(\dfrac{2^4\cdot5^2\cdot11^2\cdot7}{2^3\cdot5^3\cdot7^2\cdot11}=2\cdot\dfrac{1}{5}\cdot11\cdot\dfrac{1}{7}=\dfrac{22}{35}\)
d) \(24^4:3^4-32^{12}:16^{12}\)
\(=\left(24:3\right)^4-\left(32:16\right)^{12}\)
\(=8^4-2^{12}\)
\(=\left(2^3\right)^4-2^{12}\)
\(=2^{12}-2^{12}\)
\(=0\)
Hello Linda, my name's Tuan. I am in grade 8.
Today, I write this letter to introduce my country - Vietnam. Have you ever go to Viet Nam?
My country is not big, but there are a lot of people here. The capital of Vietnam is Ha Noi. It's very beautiful with 36 rows. The food here is rather good. The city is the biggest, bigger than Ha Noi is Ho Chi Minh City, it medium as mart, it has the most people in Vietnam, about 7.521.138 people. Tell about the food here, we can't fail about snacks/fastfood. At night, Ho Chi Minh City is very great. If you can go to Viet Nam, I will guide you to there.
Love,
@Lê Nguyên Hạo gửi pạn thân và tưởng tượng mình đang ở New York mạ
\(\frac{3n}{n+1}=\frac{3n+3-3}{n+1}=\frac{3n+3}{n+1}-\)\(\frac{3}{n+1}=3-\frac{3}{n+1}\)
Để\(\frac{3n}{n+1}\in N\Rightarrow3-\frac{3}{n+1}\in N\Rightarrow\frac{3}{n+1}\in N;\frac{3}{n+1}\le3\)
\(\Rightarrow n+1=1\)hoặc \(n+1=3\)
TH1: \(n+1=1\Rightarrow n=0\)Khi đó: \(\frac{3n}{n+1}=\frac{3.0}{0+1}=0\)
TH2: \(n+1=3\Rightarrow n=2\) Khi đó: \(\frac{3n}{n+1}=\frac{3.2}{2+1}=\frac{6}{3}=2\)
Diện tích hình vuông bằng cạnh nhân cạnh .
Vậy cạnh tờ bìa hình vuông là :
\(\sqrt{90,25}=9,5\left(m^2\right)\)
Chu vi tờ bìa đó :
\(9,5x4=38\left(m\right)\)
đ/s : 38 m
ko bít hihi