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c: =>2x+4>=2x+2-3
=>4>=-1(luôn đúng)
a: 5x+10>3x+3
=>2x>-7
=>x>-7/2
a) 3x+2>2b-3
\(\Leftrightarrow\)?
b) 5x-1>4x+3
\(\Leftrightarrow\)5x-4x>3+1
\(\Leftrightarrow\)x>4
Vậy phương trình có tập nghiệm S={x|x>4}
c)2-x/3>3-2x/5
\(\Leftrightarrow\)2-3>(-2x/5)+(x/3)
\(\Leftrightarrow\)-1>-x/15
\(\Leftrightarrow\)1<x/15
\(\Leftrightarrow\)x>1/15
Vậy phương trình có tập nghiệm S={x|x>1/15}
\(\frac{3x+5}{2}-1\le\frac{x+2}{3}+x\)
\(\Leftrightarrow\frac{3\left(3x+5\right)}{6}-\frac{6}{6}\le\frac{2\left(x+2\right)}{6}+\frac{6x}{6}\)
\(\Rightarrow3\left(3x+5\right)-6\le2\left(x+2\right)+6x\)
\(\Leftrightarrow9x+15-6\le2x+4+6x\)
\(\Leftrightarrow9x-2x-6x\le4+6-15\)
\(\Leftrightarrow x\le-5\)
Vậy ngiệm của bpt là \(\left\{x|x\le-5\right\}\)
Biểu diễn:
.....]-5.......................-0..................................>
\(\frac{x+4}{5}+\frac{3x+2}{10}< \frac{x-1}{3}\)
\(\Leftrightarrow\frac{6\left(x+4\right)}{30}+\frac{3\left(3x+2\right)}{30}< \frac{10\left(x-1\right)}{30}\)
\(\Leftrightarrow6x+24+9x+6< 10x-10\)
\(\Leftrightarrow5x+40< 0\)
\(\Leftrightarrow x< -8\)
Tự biểu diễn nha bạn
\(\frac{x+4}{5}+\frac{3x+2}{10}< \frac{x-1}{3}\)
\(\Rightarrow\frac{6\left(x+4\right)}{30}+\frac{3\left(3x+2\right)}{30}< \frac{10\left(x-1\right)}{30}\)
\(\Rightarrow6x+24+9x+6< 10x-10\)
\(5x< -40\)
\(\Rightarrow x< -8\)
A, 3X+6>0
(=)3X>-6
(=)X>-2
VẬY ...
B,10-2X≥-4
(=)-2X≥-4-10
(=)-2X≥-14
(=)X≤7
VẬY....
C,
(=)
(=) -15X+10>-3+3X
(=)-15X-3X>-3-10
(=)-18X>-13
(=)X<
1:
a: 2x-3=5
=>2x=8
=>x=4
b: (x+2)(3x-15)=0
=>(x-5)(x+2)=0
=>x=5 hoặc x=-2
2:
b: 3x-4<5x-6
=>-2x<-2
=>x>1
Ta có: \(\dfrac{x-1}{3}-\dfrac{3x+5}{2}\ge1-\dfrac{4x+5}{6}\)
\(\Leftrightarrow2\left(x-1\right)-3\left(3x+5\right)\ge6-4x-5\)
\(\Leftrightarrow2x-2-9x-15-6+4x+5\ge0\)
\(\Leftrightarrow-3x\ge18\)
hay \(x\le-6\)
Ta có:
\(-2018m>-2018n\)
\(\Rightarrow-2018m.\left(-\dfrac{1}{2018}\right)< -2018n.\left(-\dfrac{1}{2018}\right)\)
\(\Rightarrow m>n\)
b) \(x^2-x\left(x+2\right)>3x-1\)
\(\Leftrightarrow x^2-x^2-2x>3x-1\)
\(\Leftrightarrow-2x-3x>-1\)
\(\Leftrightarrow-5x>-1\)
\(\Leftrightarrow x< \dfrac{1}{5}\)
Vậy S = {\(x\) | \(x< \dfrac{1}{5}\)}
a) Ta có: -2018m > -2018n
\(\Leftrightarrow-2018m\times\left(\dfrac{-1}{2018}\right)< -2018n\times\left(\dfrac{-1}{2018}\right)\)
\(\Leftrightarrow\) m < n
\(1-2\left(x+1\right)\ge5\left(x-2\right)+2\)
\(\Leftrightarrow1-2x-2\ge5x-10+2\)
\(\Leftrightarrow-2x-5x\ge-10+2-1+2\)
\(\Leftrightarrow-7x\ge-7\)
\(\Leftrightarrow x\le1\)
\(\frac{3x+3}{3x-2}< 1\)
\(\Leftrightarrow\frac{3x-2+5}{3x-2}< 1\)
\(\Leftrightarrow1+\frac{5}{3x-2}< 1\)
\(\Leftrightarrow\frac{5}{3x-2}< 0\)
\(\Leftrightarrow3x-2< 0\)
\(\Leftrightarrow3x< 2\)
\(\Leftrightarrow x< \frac{2}{3}\)