3+4-5+6-4=...........??
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1: =1/8*9/4=9/32
2: =8/27*243/32=9/4
3: =(5/4*4/5)^5*(4/5)^2=16/25
4: \(=\left(-\dfrac{5}{6}\cdot\dfrac{6}{5}\right)^2\cdot\left(\dfrac{6}{5}\right)^2=\dfrac{36}{25}\)
5: \(=\left(-\dfrac{4}{3}\right)^3\cdot\left(\dfrac{3}{4}\right)^{10}=\left(-1\right)\left(\dfrac{3}{4}\right)^7=-\left(\dfrac{3}{4}\right)^7\)
6: \(=\left(\dfrac{1}{3}\cdot\dfrac{-9}{2}\right)^4\left(-\dfrac{9}{2}\right)^2=\left(-\dfrac{3}{2}\right)^4\cdot\dfrac{81}{4}=\dfrac{9}{4}\cdot\dfrac{81}{4}=\dfrac{729}{16}\)
8: =(0,2*5)^4*5^2=25
10: =-0,5^5*2^10
=-0,5^5*2^5*2^5
=-32
13: =(0,5*2)^2*2^2=4
![](https://rs.olm.vn/images/avt/0.png?1311)
\(9+2+5+3+7+8+4+2+9+6+4+65+6+7+4+6+3+7+4+8+5+9+08+87+1+2+3+4+2+3+2+5+6+767+5+75+6+4+6+5+66+5+7+546+46+43+6+3+6+4+6+7+8878+68+68+6+7+9+9=10961\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải chi tiết:
3 + 4 – 5 = 2 | 8 – 6 + 3 = 5 | 10 – 3 – 2 = 5 |
5 + 1 + 2 = 8 | 4 + 4 – 6 = 2 | 5 + 5 – 7 = 3 |
6 – 4 + 8 = 10 | 9 – 6 + 5 = 8 | 4 + 3 – 3 = 4 |
![](https://rs.olm.vn/images/avt/0.png?1311)
Sửa đề: 3^5+3^5+3^5; 2^x
=>\(2^x=\dfrac{4^5\cdot4}{3^5\cdot3}\cdot\dfrac{6^5\cdot6}{2^5\cdot2}\)
=>\(2^x=\left(\dfrac{4}{3}\right)^6\cdot\left(\dfrac{6}{2}\right)^6=4^6=2^{12}\)
=>x=12
![](https://rs.olm.vn/images/avt/0.png?1311)
b) Tính theo thứ tự từ trái sang phải.
4 + 5 - 7 = 2 6 - 4 + 8 = 10 10 - 9 + 6 = 7 9 - 4 - 3 = 2
1 + 2 + 6 = 9 3 + 2 + 4 = 9 8 - 2 + 4 = 10 8 - 4 + 3 = 7
3 - 2 + 9 = 10 7 - 5 + 3 = 5 3 + 5 - 6 = 2 2 + 5 - 4 = 3
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải chi tiết:
3 + 4 > 6 | 6 + 1 > 6 | 5 + 1 = 6 |
3 + 4 = 7 | 5 + 2 > 6 | 7 – 5 > 3 |
7 – 4 < 4 | 7 – 2 = 5 | 7 – 6 = 1 |
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải chi tiết:
3 + 4 + 2 = 9 | 3 + 7 – 6 = 4 | 10 – 8 + 7 = 9 |
4 + 3 + 3 = 10 | 5 + 4 – 8 = 1 | 9 – 6 + 5 = 8 |
4 + 5 – 7 = 2 | 3 + 5 – 6 = 2 | 9 – 4 – 3 = 2 |
![](https://rs.olm.vn/images/avt/0.png?1311)
đáp án = 4
3 + 4 - 5 + 6 - 4 = 4 nhé !
CHÚC BẠN HOK TỐT Ạ !