cho BT

1. M=\(\left(\dfrac{\sqrt{x}}{\sqrt{x}-2}+\dfrac{\sqrt{x}}{\sqrt{x}+2}\right)\) . \(\dfrac{x-4}{\sqrt{4x}}\)

a) tìm TXĐ của M

b) Rút gọn BT M

c)Tìm x để M>3

2. A=\(\left(\dfrac{3}{\sqrt{a+1}}+\sqrt{1-a}\right)\) : \(\left(\dfrac{3}{\sqrt{1-a^2}}+1\right)\)

a)Rút gọn BT A

b)Tìm a để A=\(\sqrt{A}\)

c)Tính A khi a=\(\dfrac{\sqrt{3}}{2+\sqrt{3}}\)

1.Rút gọn các BT sau:

a) 2\(\sqrt{3}\) +\(\sqrt{\left(2-\sqrt{3}\right)^2}\)

b)\(\dfrac{5+\sqrt{5}}{5-\sqrt{5}}\) +\(\dfrac{5-\sqrt{5}}{5+\sqrt{5}}\)

c) \(\sqrt{17-2\sqrt{32}}\) +\(\sqrt{17+2\sqrt{32}}\)

By 2016, in Ha Tinh province, there was a severe water pollution case by the Ha Tinh formosa company. The cause of the pollution is due to violations and incidents during the trial operation of the plant complex of Formosa Ha Tinh, the factory has discharged toxic to the sea, hydroxide, exceeds the level allowing a number of dead sea creatures to cause the fishermen to lose their jobs. Not only the economic losses, the incidents and incidents also negatively affect the health and life. living, tourism development activities, economic community of neighboring neighborhood, causing psychological instability for people. forced the factory must compensate and apologize to the entire Central people. Here I have the idea to protect the water from the waste: the State must strictly supervise the operation of the area industrial parks, economic zones and large projects that are likely to cause high environmental pollution. Investing in infrastructure for environmental protection activities, the Ministry of Natural Resources and Environment, should be paid attention and investment right from head with proportional proportions.

Let's work together to protect the environment!

gọi số tuổi của Phương hiện nay là x. ĐK: x>0, x nguyên

thì số tuổi của mẹ là 3x

Tuổi Phương sau 13 năm là x+13

thì tuổi của mẹ 13 năm sau là 3x+13

Theo bài ra ta có pt: \(\dfrac{3x+13}{2}\)=x+13

<=>3x+13=2(x+13)

<=>3x+13=2x+26

<=>3x-2x=26-13

<=>x=13

vậy số tuổi của Phương hiện nay là 13

cờ tướng mới có quân sĩ

a)số hình tam giác trong hình là 1 hình

b)số hình vuông trong hình là 1​ hình