100 x2 x 4 x 6
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\(\frac{25x4x32+16x2x50}{100x6x8x2}=\frac{100x16x2+16x100}{100x6x16}=\frac{100x16\left(2+1\right)}{100x16x6}=\frac{3}{6}=\frac{1}{2}.\)
~~ học tốt nhé ~~~
a: x^2+10x+100
=x^2+10x+25+75=(x+5)^2+75>0 với mọi x
b: -x^2+4x-100
=-(x^2-4x+100)
=-(x^2-4x+4+96)
=-(x-2)^2-96<0 với mọi x
c: x^2-5x+6
=x^2-5x+25/4-1/4
=(x-5/2)^2-1/4 chưa chắc lớn hơn 0 đâu nha bạn
\(x+1+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=5750\)
\(\Rightarrow x+1+x+2+x+3+...+x+100=5750\)
\(\Rightarrow100x+1+2+3+...+100=5750\)
\(\Rightarrow100x+\left[\left(\dfrac{100-1}{1}+1\right):2\right]\left(100+1\right)=5750\)
\(\Rightarrow100x+5050=5750\)
\(\Rightarrow100x=700\Rightarrow x=7\)
\(25-\left(30+x\right)=x-\left(123-67\right)\)
\(\Rightarrow25-30+x=x-123+67\)
\(\Rightarrow-5+x=x-56\)
\(\Rightarrow x\in\varnothing\)
\(\left(x-5\right)^4=\left(x-5\right)^6\)
\(\Rightarrow\left(x-5\right)^6-\left(x-5\right)^4=0\)
\(\Rightarrow\left(x-5\right)^4\left[\left(x-5\right)^2-1\right]=0\)
\(\Rightarrow\left[{}\begin{matrix}\left(x-5\right)^4=0\Rightarrow x=5\\\left(x-5\right)^2-1=0\Rightarrow\left(x-5\right)^2=1\Rightarrow x=6;4\end{matrix}\right.\)
\(\left(x^2+1\right)\left(x-3\right)< 0\)
\(\Rightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x^2+1>0\Rightarrow x^2>-1\\x-3< 0\Rightarrow x< 3\end{matrix}\right.\\\left\{{}\begin{matrix}x^2+1< 0\Rightarrow x^2< -1\\x-3>0\Rightarrow x>3\end{matrix}\right.\end{matrix}\right.\)
Vậy...
Bài 1:
a: \(\Leftrightarrow x^2-5x+6< =0\)
=>(x-2)(x-3)<=0
=>2<=x<=3
b: \(\Leftrightarrow\left(x-6\right)^2< =0\)
=>x=6
c: \(\Leftrightarrow x^2-2x+1>=0\)
\(\Leftrightarrow\left(x-1\right)^2>=0\)
hay \(x\in R\)
e: =>-40+3+33+40-x=47
=>36-x=47
=>x=-11
f: =>x(x-3)(11-x)(11+x)=0
hay \(x\in\left\{0;3;11;-11\right\}\)
g: =>-62-38-x+2x=-100
=>x-100=-100
hay x=0
100 x 2 x 4 x 6
= 100 x ( 2 x 4 x 6 )
= 100 x 48
= 4800
đúng đó tk mk nhé ! hihiii
= 4800 nha bn, nhớ k mk á mình làm đầu tiên