GIẢI GIÚP MIK VS AK
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1) \(=\left(2x\right)^2-3^2=\left(2x-3\right)\left(2x+3\right)\)
2) \(=8^2-\left(5y\right)^2=\left(8-5y\right)\left(8+5y\right)\)
3) \(=1-\left(7x\right)^2=\left(1-7x\right)\left(1+7x\right)\)
4) \(=\left(16xy\right)^2-1=\left(16xy-1\right)\left(16xy+1\right)\)
5) \(=2\left(x^2-9y^2\right)=2\left(x-3y\right)\left(x+3y\right)\)
6) \(=3\left(a^2-4b^4\right)=3\left(a-2b^2\right)\left(a+2b^2\right)\)
7) \(=\left(a^2\right)^2-4^2=\left(a^2-4\right)\left(a^2+4\right)=\left(a-2\right)\left(a+2\right)\left(a^2+4\right)\)
8) \(=9^2-\left(x^2\right)^2=\left(9-x^2\right)\left(9+x^2\right)=\left(3-x\right)\left(3+x\right)\left(9+x^2\right)\)
9) \(=\left(6b\right)^2-a^2=\left(6b-a\right)\left(6b+a\right)\)
10) \(=\left(8x^3\right)^2-27^2=\left(8x^3-27\right)\left(8x^3+27\right)=\left(2x-3\right)\left(4x^2+6x+9\right)\left(2x+3\right)\left(4x^2-6x+9\right)\)
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C = 6/2.5 + 6/5.8 + 6/8.11 +...+ 6/29.32
C = 2.(3/2.5 + 3/5.8 + 3/8.11 + ... + 3/29.32)
C = 2.(1/2 - 1/5 + 1/5 - 1/8 + 1/8 - 1/11 + ... + 1/29 - 1/32)
C = 2.(1/2 - 1/32)
C = 2.15/32
C = 15/16
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1 Lan goes to the supermarket on foot
2 Our garden has many flowers
3 He has black hair
4 We don't have to finish the task today (not necessary => don't have to: không cần làm gì, còn must not là không được làm gì nên câu này đề cho must là sai)
5 Are there 23 students in your class?
6 Lan is not as young as Minh
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10 + 20 + 10 + 90
= ( 10 + 20 ) + ( 10 + 90 )
= 30 + 100
= 130
HỌC TỐT
10 + 20 + 10 + 90
= ( 10 + 20 ) + ( 10 + 90 )
= 30 + 100
= 130
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left|x-2\right|+x-3=0\)
\(\Leftrightarrow\left|x-2\right|=-x+3\)
Công thức tổng quát : \(\left|A\left(x\right)\right|=B\left(x\right)\Rightarrow\orbr{\begin{cases}A\left(x\right)=B\left(x\right)\\A\left(x\right)=-B\left(x\right)\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x-2=-x+3\\x-2=x-3\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=\frac{5}{2}\\0\ne-5\end{cases}}\)
Vậy x = 5/2