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\(x^2+y^4=0\)
\(x^2\ge0;y^4\ge0\)
Dấu "=" xảy ra khi:
\(x^2=0\Rightarrow x=0\)
\(y^4=0\Rightarrow y=0\)
\(\left(x-1\right)^2+\left(y+2\right)^2=0\)
\(\left(x-1\right)^2\ge0;\left(y+2\right)^2\ge0\)
Dấu"=" xảy ra khi:
\(\left(x-1\right)^2=0\Rightarrow x-1=0\Rightarrow x=1\)
\(\left(y+2\right)^2=0\Rightarrow y+2=0\Rightarrow y=-2\)
\(\left(x-11+y\right)^2+\left(x-4-y\right)^2=0\)
\(\left(x-11+y\right)^2\ge0;\left(x-4-y\right)^2\ge0\)
Dấu "=" xảy ra khi:
\(\left(x-11+y\right)^2=0\Rightarrow x-11+y=0\)
\(\left(x-4-y\right)^2=0\Rightarrow x-4-y=0\)
\(\Rightarrow\left(x-11+y\right)-\left(x-4-y\right)=0\)
\(\Rightarrow x-11+y-x+4+y=0\)
\(\Rightarrow2y-7=0\Rightarrow2y=7\Rightarrow y=\dfrac{7}{2}\)
Thay \(\dfrac{7}{2}\)vào \(2y\) ta có:
\(x-11+y=0\Rightarrow x-11+\dfrac{7}{2}=0\Rightarrow x-\dfrac{15}{2}=0\Rightarrow x=\dfrac{15}{2}\)
1)=>3(x-5)(2x+9)+3(x-5)=0=>(x-5)(6x+30)
=>x-5=0=>x=5
6x+30=0=>x=-5
2)=>x^2-16=0=>x=+-4
12-4x=0=>x=3
3)=>9-x^2=0=>x=+-3
4x-8=0=>x=2
4)=>8-x^3=0=>x=3
5^x-125=0=>x=2
5)=>2^x.2^x=8=>2^2x=8=>2x=3=>x=1,5
a, => x+5>0;x-4>0 hoặc x+5<0;x-4<0
=> x>4 hoặc x<-5
b, Vì x-3 < x+7 => x-3<0;x+7>0
=> x<3;x>-7 => -7<x<3
c, Vì x^2+1 >0 => x+3 > 0 => x>-3
d, Vì x^2-4 > x^2-16
=> x^2-4>0;x^2-16<0
=> x^2>4;x^2<16
=> 4<x^2<16
=> 2 < = x < = 4 hoặc -4 < = x < = -2
Tk mk nha
1: (x-1)(x-2)<=0
=>1<=x<=2
mà x là số nguyên
nên \(x\in\left\{1;2\right\}\)
2: \(\left(2x-4\right)\left(2x-10\right)< 0\)
=>4<2x<10
=>2<x<5
mà x là số nguyên
nên \(x\in\left\{3;4\right\}\)
4: \(\left(x^2-7\right)\left(x^2-1\right)< =0\)
\(\Leftrightarrow1\le x^2\le7\)
mà x là số nguyên
nên \(x\in\left\{1;-1;2;-2\right\}\)
\(1.\left(x-1\right)^2=4=\left(-2\right)^2=2^2\)
\(TH1:x-1=2\Rightarrow x=3\)
\(TH2:x-1=-2\Rightarrow x=-1\)
Vậy:...
\(2.\left(1+x\right)^2=9=\left(-3\right)^2=3^2\)
\(TH1:1+x=3\Rightarrow x=2\)
\(TH2:1+x=-3\Rightarrow x=-4\)
Vậy:....
\(3,\left(x+2019\right)^4=1\Rightarrow\left(x+2019\right)^4=1^4\)
\(\Rightarrow\orbr{\begin{cases}x+2019=1\\x+2019=-1\end{cases}\Rightarrow\orbr{\begin{cases}x=-2018\\x=-2020\end{cases}}}\)
\(4,\left(x+10\right)^3=1\Rightarrow\left(x+10\right)^3=1^3\)
\(\Rightarrow x+10=1\)
\(\Rightarrow x=-9\)
\(4^2-2^2.3+8.5^0\)
\(=16-4.3+8.1\)
\(=12\)
\(5^4.\left[8^2:4^2.\left(2^3+10^0\right)\right]\)
\(=625.\left[64:16.\left(8+1\right)\right]\)
\(=625.\left(64:16.9\right)\)
\(=22500\)
\(11^2.5^3-11^2.25\)
\(=11^2.\left(5^3-25\right)\)
\(=121.\left(125-25\right)\)
\(=12100\)
học tốt
`x^2 - 4 = 0`
`x^2 = 0 + 4`
`x^2 = 4`
`x^2 = (+-2)^2`
`x = +-2`
X=2