C=|2x-3/5|+4/3>=4/3

Dấu = xảy ra khi x=3/10

D=|x-3|+|-x-2|>=|x-3-x-2|=5

Dấu = xảy ra khi -2<=x<=3

đợi tý

Đã trả lời rồi còn độ tí đồ ngull

Tìm GTNN chứ nhỉ e

\(D=\left|2022-x\right|+\left|x-1\right|\ge\left|2022-x+x-1\right|=2021\)

Dấu "=" xảy ra \(\Leftrightarrow\left(2022-x\right)\left(x-1\right)\ge0\)

\(\Leftrightarrow1\le x\le2022\)

Vậy Min D=2021 \(\Leftrightarrow1\le x\le2022\)

\(A=\left|x+1\right|-3\\ min_A=-3.khi.x+1=0\Leftrightarrow x=-1\\ B=-\left|x-\dfrac{3}{7}\right|-\dfrac{1}{4}\\ max_B=-\dfrac{1}{4}.khi.\left(x-\dfrac{3}{7}\right)=0\Leftrightarrow x=\dfrac{3}{7}\)

a)

A = |x + 1| - 3 ≥ 0 - 3 = -3

Dấu "=" xảy ra khi x + 1 = 0 hay x = -1

Do đó A đạt GTNN là -3 khi x = -1

b)

\(B=-\left|x-\dfrac{3}{7}\right|-\dfrac{1}{4}\le-0-\dfrac{1}{4}=-\dfrac{1}{4}\)

Dấu "=" xảy ra khi khi \(x-\dfrac{3}{7}=0\) hay \(x=\dfrac{3}{7}\)

Do đó B đạt GTLN là \(-\dfrac{1}{4}\) khi \(x=\dfrac{3}{7}\)

2022/2023 . (9/13 - 7/11) + 2022/2023 . (17/13- 4/17)

= 2022/2023 . 190/43 + 2022/2023 . 237/221

= 2022/2023 . (190/43 + 237/221)

= 2022/2023 . 52181/9503

= 105509982/19224569

Sửa: \(\dfrac{2022}{2023}\cdot\left(\dfrac{9}{13}-\dfrac{7}{11}\right)+\dfrac{2022}{2023}\cdot\left(\dfrac{17}{13}-\dfrac{4}{11}\right)\)

\(=\dfrac{2022}{2023}\cdot\left(\dfrac{9}{13}-\dfrac{7}{11}+\dfrac{17}{13}-\dfrac{4}{11}\right)\)

\(=\dfrac{2022}{2023}\cdot\left(2-1\right)\)

\(=\dfrac{2022}{2023}\cdot1\)

\(=\dfrac{2022}{2023}\)

\(a,B=4,2+\left|x+1,5\right|\ge4,2\\ B_{min}=4,2\Leftrightarrow x+1,5=0\Leftrightarrow x=-1,5\\ b,C=\dfrac{4}{5}-\left|2x+1\right|\le\dfrac{4}{5}\\ C_{max}=\dfrac{4}{5}\Leftrightarrow2x+1=0\Leftrightarrow x=-\dfrac{1}{2}\)

a, Do |x +1,5| ≥ 0 ⇒ 4,2 + |x + 1,5| ≥ 4,2

Dấu "=" xảy ra ⇔ x + 1,5 = 0 ⇔  x = - 1,5

Vậy B_min=  4,2 ⇔ x= -1,5

b, Do |2x + 1| ≥ 0 ⇒ \(\dfrac{4}{5}-\left|2x+1\right|\le\dfrac{4}{5}\)

Dấu "=" xảy ra ⇔ 2x + 1 = 0 ⇔ 2x = -1 ⇔ \(x=-\dfrac{1}{2}\)

Vậy C_max = \(\dfrac{4}{5}\Leftrightarrow x=-\dfrac{1}{2}\)

\(B=-\left(\dfrac{4}{9}x-\dfrac{2}{15}\right)^6+3\)

vì \(B=-\left(\dfrac{4}{9}x-\dfrac{2}{15}\right)^6\le0,\forall x\inℝ\)

\(\Rightarrow B=-\left(\dfrac{4}{9}x-\dfrac{2}{15}\right)^6+3\le3\)

Dấu "=" xảy ra khi và chỉ khi

\(\dfrac{4}{9}x-\dfrac{2}{15}=0\Rightarrow\dfrac{4}{9}x=\dfrac{2}{15}\Rightarrow x=\dfrac{9}{15}\)

Vậy \(GTLN\left(B\right)=3\left(tạix=\dfrac{9}{15}\right)\)

\(A=\left(2x+\dfrac{1}{3}\right)^4-1\)

vì \(\left(2x+\dfrac{1}{3}\right)^4\ge0,\forall x\inℝ\)

\(\Rightarrow A=\left(2x+\dfrac{1}{3}\right)^4-1\ge-1\)

Dấu "=" xảy ra khi và chỉ khi

\(2x+\dfrac{1}{3}=0\Rightarrow2x=-\dfrac{1}{3}\Rightarrow x=-\dfrac{1}{6}\)

\(\Rightarrow GTNN\left(A\right)=-1\left(tạix=-\dfrac{1}{6}\right)\)

Ta thấy \(\left|x+2\right|\) hơn \(\left|x+1\right|\) 1 đơn vị

Mà \(\left|x+1\right|\ge0\) \(\Rightarrow\left|x+1\right|^{2022}\ge0\)

\(\Rightarrow\left|x+2\right|\ge1=>\left|x+2\right|^{2023}\ge1\)

\(\Rightarrow\left|x+1\right|^{2022}+\left|x+2\right|^{2023}\ge1\)

Dấu '' = '' xảy ra khi \(\left\{{}\begin{matrix}x+1=0\\x+2=1\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x=-1\\x=-1\end{matrix}\right.\Rightarrow x=-1\)

Vậy phương trình có nghiệm x = -1

x còn có thể có TH -2 mà bn
\(x=-2=>\left|-2+1\right|^{2022}+\left|-2+2\right|^{2023}=1+0=1\)

Nh vẫn cảm ơn nha

a: |x|+2003>=2003

=>A<=2022/2003

Dấu = xảy ra khi x=0

b: |x|+1>=1

=>(|x|+1)^10>=1

=>B>=2010

Dấu = xảy ra khi x=0