mọi người chỉ em topic1,2 với, đơn giản thôi ạ
em gần thi r
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bài 2 code python đơn giản thôi cho dễ nhớ ng kia em thi r ;-; sợ học không kịp
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18 tháng 10 2021
Bài III:
1: Ta có: \(\sqrt{x-3}=5\)
\(\Leftrightarrow x-3=25\)
hay x=28
2: Ta có: \(\dfrac{\sqrt{x}-2}{\sqrt{x}-5}=\dfrac{1}{3}\)
\(\Leftrightarrow3\sqrt{x}-6=\sqrt{x}-5\)
\(\Leftrightarrow2\sqrt{x}=1\)
hay \(x=\dfrac{1}{4}\)
6 tháng 2 2020
5x + 13 ⋮ 2x + 1
=> 5x + 2,5 + 11,5 ⋮ 2x + 1
=> 2,5(2x + 1) + 11,5 ⋮ 2x + 1
=> 11,5 ⋮ 2x + 1
=> 23 ⋮ 2x + 1
=> ...
6 tháng 2 2020
=>5x+13chia hết cho 2x+1
ta có : 2(5x+13) chia hết 2x+1
5(2x+1) chia hết 2x+1
=>10x+26 chia hết 2x+1
10x +5 chia hết 2x+1
=>[(10x+26)-(10x+5)]chia hết 2x+1
=>21chia hết 2x+1 hay 2x +1 thược Ư(21) =(1 ;3;7;21;-1;-3;-7;-21)
ta có bảng:
| 2x+1 | 1 | 3 | 7 | -1 | -3 | -7 | 21 | -21 |
| x | 0 | 1 | 3 | -1 | -2 | -4 | 10 | -11 |
| nhận xét | chọn | chọn | chọn | chọn | chọn | chọn | chọn | chọn |
vậy x thuộc {0;1;3;-1;-2;-4;10;-11}
2P
0
T1:
Currently, families are giving their children too much use of electronics such as phones and computers. They have a great influence on a child's nervous system. Not only affects the nervous system, children also have the ability to affect vision and brain. Since there are so many emerging games now, children often stay up late, affecting sleep. Families need to put their children under house arrest, let their children play less on phones and computers, and exercise outdoors to have a healthy body.
T2:
Nowadays, the Earth is worse. Everywhere is trash. Some oceans have been hit by "garbage floods." People even mistake garbage for fish. Garbage also has a significant impact on the natural terrestrial environment. Currently, there are already a number of large companies promoting environmental protection. They also show us the harm of garbage covering the WHOLE WORLD in the future. Maybe in the future, we will have restaurants that process food from garbage, such as spaghetti with meat made of plastic bottles, noodles with plastic... Scientists believe that soon the amount of garbage is greater than the number of fish...