how long have you practising the piano? A. in two years time B.two years ago C.for two years D.the previous two years
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\(\left(4x-1\right)\left(4x+1\right)=\left(4x-1\right)^2\)
\(\Leftrightarrow\left(4x-1\right)\left(4x+1\right)-\left(4x-1\right)^2=0\)
\(\Leftrightarrow\left(4x-1\right)\left[\left(4x+1\right)-\left(4x-1\right)\right]=0\)
\(\Leftrightarrow2\left(4x-1\right)=0\)
\(\Leftrightarrow4x-1=0\)
\(\Leftrightarrow x=\dfrac{1}{4}\)
(4\(x\) - 1).(4\(x\) + 1) = (4\(x\) - 1)2
(4\(x-1\)).(4\(x\) + 1) - (4\(x\) - 1)2 = 0
(4\(x\) - 1).(4\(x\) + 1 - 4\(x\) + 1) = 0
(4\(x\) - 1).[(4\(x\) - 4\(x\)) + (1 +1)] = 0
(4\(x\) - 1).[0 + 2] = 0
(4\(x\) - 1).2 = 0
4\(x\) - 1 = 0
4\(x\) = 1
\(x=\dfrac{1}{4}\)
Vậy \(x=\dfrac{1}{4}\)
`x^3 - y^6 `
`= x^3 - (y^2)^3`
`= (x - y^2) (x^2 + xy^2 + y^4) `
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2 My daughter wants to open a jewelry store when she grows up
Baking also helps me to relax after a busy week with lots of homework
giúp mình với
Chọn C nhé