Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a,\left(x-1\right)^2+x^2\le\left(x+1\right)^2+\left(x+2\right)^2\\ \Leftrightarrow x^2-2x+1+x^2\le x^2+2x+1+x^2+4x+4\\ \Leftrightarrow2x^2-2x+1\le2x^2+6x+5\\ \Leftrightarrow-8x-6\le0\\ \Leftrightarrow x\ge\dfrac{3}{4}\)
\(b,\left(x^2+1\right)\left(x-6\right)\le\left(x-2\right)^3\\ \Leftrightarrow x^3+x-6x^2-6\le x^3-6x^2+12x-8\\ \Leftrightarrow11x-2\ge0\\ \Leftrightarrow x\ge\dfrac{2}{11}\)
a: \(\Leftrightarrow x^2-2x+1+x^2< =x^2+2x+1+x^2+4x+4\)
=>-2x+1<=6x+5
=>-7x<=4
hay x>=-4/7
b: \(\Leftrightarrow x^3-6x^2+x-6-x^3+6x^2-12x+8< =0\)
=>-11x+2<=0
=>-11x<=-2
hay x>=2/11
Bài 1 :
Ta có : \(\dfrac{3x+5}{2}-1\le\dfrac{x+2}{3}+x\)
\(\Leftrightarrow\dfrac{3x+5}{2}-1-\dfrac{x+2}{3}-x\le0\)
\(\Leftrightarrow\dfrac{3\left(3x+5\right)-6-2\left(x+2\right)-6x}{6}\le0\)
\(\Leftrightarrow9x+15-6-2x-4-6x\le0\)
\(\Leftrightarrow x\le-5\)
Mà \(\left\{{}\begin{matrix}x\in Z\\x>-10\end{matrix}\right.\)
Vậy \(x\in\left\{-5;-6;-7;-8;-9\right\}\)
b3\(\Leftrightarrow2x^2+5x-3-3x+1\le x^2+2x-3+x^2-5\\ \Leftrightarrow0.x\le-6\Leftrightarrow x\in\varnothing\)
a: \(\Leftrightarrow x^2+4x+4+3x^2+6x+3>=4x^2-4\)
=>10x+7>=-4
=>10x>=-11
hay x>=-11/10
b: \(\Leftrightarrow6\left(x-1\right)-4\left(x-2\right)\le12x-3\left(x-3\right)\)
=>6x-6-4x+8<=12x-3x+9
=>2x+2<=9x+9
=>-7x<=7
hay x>=-1
a: ⇔x2+4x+4+3x2+6x+3>=4x2−4⇔x2+4x+4+3x2+6x+3>=4x2−4
=>10x+7>=-4
=>10x>=-11
hay x>=-11/10
b: ⇔6(x−1)−4(x−2)≤12x−3(x−3)⇔6(x−1)−4(x−2)≤12x−3(x−3)
=>6x-6-4x+8<=12x-3x+9
=>2x+2<=9x+9
=>-7x<=7
hay x>=-1
\(bpt\Leftrightarrow4x^2+4x+1+3x-3x^2\le x^2+4x+4\\ \Leftrightarrow3x\le3\\ \Leftrightarrow x\le1\)
Vậy ...........
( Xem cách làm nhưng vẫn phải biết rút ra kiến thức bạn nhé :D)
Ta có: \(\left(2x+1\right)^2+3x\left(1-x\right)\le\left(x+2\right)^2\)
\(\Leftrightarrow4x^2+4x+1+3x-3x^2-x^2-4x-4\le0\)
\(\Leftrightarrow3x\le3\)
hay \(x\le1\)
\(\Leftrightarrow x^2-4x+4+2x-2\le x^2+4\)
\(\Leftrightarrow x^2-x^2-4x+2x+4-2-4\le0\)
\(\Leftrightarrow-2x-2\le0\)
\(\Leftrightarrow x\le-1\)
(x - 2)^2 + 2(x - 1) =< x^2 + 4
<=> x^2 - 4x + 4 + 2x - 2 =< x^2 + 4
<=> x^2 - 2x - 2 =< x^2 + 4
<=> x^2 - 2x - 2 - x^2 =< 4
<=> -2x + 2 =< 4
<=> -2x =< 4 - 2
<=> -2x =< 2
<=> x =< -1