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HT
a) \(\dfrac{3}{4}+\dfrac{9}{5}\div\dfrac{3}{2}-1=\dfrac{3}{4}+\dfrac{18}{15}-1=\dfrac{39}{20}-1=\dfrac{19}{20}\)
b) \(\dfrac{6}{7}\cdot\dfrac{8}{13}+\dfrac{6}{13}\cdot\dfrac{9}{7}-\dfrac{4}{13}\cdot\dfrac{6}{7}=\dfrac{48}{91}+\dfrac{54}{91}-\dfrac{24}{91}=\dfrac{48+51-24}{91}=\dfrac{78}{91}=\dfrac{6}{7}\)
c) \(\dfrac{-3}{7}+\left(\dfrac{3}{-7}-\dfrac{3}{-5}\right)\)\(=\dfrac{-3}{7}+\left(\dfrac{-3}{7}-\dfrac{-3}{5}\right)=\dfrac{-3}{7}+\dfrac{6}{35}=-\dfrac{9}{35}\)
a: Xét tứ giác AEHF có
\(\widehat{AEH}=\widehat{AFH}=\widehat{FAE}=90^0\)
Do đó: AEHF là hình chữ nhật
ờ...tớ ko nhầm thì thừa are
nếu bỏ are thì she's making a papper boat
1 How long do you live in HN
2 How often did you go to the movies
3 What did Mrs Robinson buy
4 When was your father in Nghe An
5 How do they go to school
6 Why didn't she go to class
7 Who left home at 7o'clock yesterday
8 What subject does he study in the high school
9 What is your favorite hobby
10 How far is it
Điều kiện : \(x\in\left\{2,4\right\}\)
Biến đổi PT về dạng :
\(5\left(x-3\right)\left(x-4\right)+5\left(x-2\right)^2=16\left(x-2\right)\left(x-4\right)\)
\(\Leftrightarrow5\left(x^2-7x+12\right)+5\left(x^2-4x+4\right)=16\left(x^2-6x+8\right)\)
\(\Leftrightarrow6x^2-41x+48=0\Leftrightarrow6x^2-9x-32x+48=0\)
\(\Leftrightarrow6x\left(x-\dfrac{3}{2}\right)-32\left(x-\dfrac{3}{2}\right)=0\Leftrightarrow\left(x-\dfrac{3}{2}\right)\left(6x-32\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x-\dfrac{3}{2}=0\\6x-32=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{3}{2}\\x=\dfrac{16}{3}\end{matrix}\right.\)
Vậy PT có nghiệm ...
Đáp số là x=1,5 nhé