(x-1)^2=1 help me plsss
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ĐKXĐ: x>=0; x<>1
PT =>\(\dfrac{\left(\sqrt{x}+3\right)\left(-2x+6\right)}{\left(\sqrt{x}-1\right)^2}=0\)
=>6-2x=0
=>x=3
2 have been reading - haven't finished
3 have gone
4 am going to have
5 have washed
6 have broken
7 add - mix
8 have used
9 have lived
10 is always doing
11 am going
12 has taught
13 have already bought
14 always meet
1 She advised him to go on holiday when the weather got warmer
2 She warned them to keep out of that room at all time
3 He reminded me to post those letter
4 He asked them not to go into his study
5 I told him not to wait for me
7 She advised him not to go on holiday yet
8 She warned them against entering that room
^A =130
^B =130
mà 2 góc này ở vị trí sole trong
⇒a//y(1)
^O=180⇒^O1=180-130
⇒^O1=50
Mà Ox là tia phân giác ⇒ ^O1=^O2=50
⇒^O2=B=50
Mà 2 góc này ở vị tri sole trong
⇒y//b(2)
Từ (1)(2)⇒a//b
\(P=x^4+2x^2+1+x^4+2x^3+x^2-3\)
\(P=2x^4+2x^3+3x^2-2\)
\(P=x^2\left(2x^2+2x+3\right)-2=\dfrac{1}{2}x^2\left[\left(2x+1\right)^2+5\right]-2\ge-2\)
\(P_{min}=-2\) khi \(x=0\)
ĐKXĐ: \(x>0\)
\(S=\left(\frac{1}{\sqrt{x}}+\frac{\sqrt{x}}{\sqrt{x}+1}\right)\div\left(\frac{\sqrt{x}}{x+\sqrt{x}}\right)=\left(\frac{1}{\sqrt{x}}+\frac{\sqrt{x}}{\sqrt{x}+1}\right)\left(\frac{\sqrt{x}\left(\sqrt{x}+1\right)}{\sqrt{x}}\right)\)
\(=\left(\frac{1}{\sqrt{x}}+\frac{\sqrt{x}}{\sqrt{x}+1}\right)\left(\sqrt{x}+1\right)=\frac{\sqrt{x}+1}{\sqrt{x}}+\sqrt{x}=\frac{x+\sqrt{x}+1}{\sqrt{x}}\)
(x-1)2 = 1
(x-1)2 = 12
=> x-1=1
x=1+1
x=2
Vậy x=2
_HT_