a) x - 10 - (- 12) = 4

x-10=4+(-12)

x-10=-8

x=-8+10

x=2

=>giá trị tuyệt đối của x - 10 - (- 12) = 4 =/2/=2

b) 1

c) 2

tick nha

a) 2

b) 1

c) 2

tick nha

2. để Bmax thì x+2/3 đạt GTNN=> x+2/3=0=>x=-2/3

3. 4x=21

    4x=-21 tự tính

x-1.5=2

x-1.5=-2

x+3/4=1/2

x+3/4=-1/2

Bài 1:

\(a)\left(\dfrac{-28}{29}\right).\left(\dfrac{-38}{16}\right)=\dfrac{\left(-28\right).\left(-38\right)}{29.16}=\dfrac{1064}{464}=\dfrac{133}{58}\)

\(b)\left(\dfrac{-21}{16}\right).\left(\dfrac{-24}{7}\right)=\dfrac{\left(-21\right).\left(-24\right)}{16.7}=\dfrac{504}{112}=\dfrac{9}{2}\)

\(c)\left|\dfrac{-12}{17}\right|.\left(\dfrac{-34}{9}\right)=\dfrac{12}{17}.\left(\dfrac{-34}{9}\right)=\dfrac{12.\left(-34\right)}{17.9}=\dfrac{-408}{153}=\dfrac{-8}{3}\)

Bài 3:

\(a)\left|x\right|=21\)

\(\Rightarrow\left[{}\begin{matrix}x=-21\\x=21\end{matrix}\right.\)

\(b)\left|x\right|=\dfrac{17}{9};x< 0\)

\(\Rightarrow x=\dfrac{-17}{9}\)

\(c)\left|x\right|=1\)

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

\(\left|x\right|=\dfrac{2}{5}\)

\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{2}{5}\\x=\dfrac{-2}{5}\end{matrix}\right.\)

\(d)\left|x\right|=0,35;x>0\)

\(\Rightarrow x=0,35\)

Bài 4:

\(a)\left|x\right|-1,7=2,3\)

\(\Rightarrow\left[{}\begin{matrix}x-1,7=2,3\\x-1,7=-2,3\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=4\\x=\dfrac{-3}{5}\end{matrix}\right.\)

\(b)\left|x\right|+\dfrac{3}{4}-\dfrac{1}{3}=0\)

\(\Rightarrow\left|x\right|+\dfrac{3}{4}=0+\dfrac{1}{3}\)

\(\Rightarrow\left|x\right|+\dfrac{3}{4}=\dfrac{1}{3}\)

\(\Rightarrow\left[{}\begin{matrix}x+\dfrac{3}{4}=\dfrac{1}{3}\\x+\dfrac{3}{4}=\dfrac{-1}{3}\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{-5}{12}\\x=\dfrac{-13}{12}\end{matrix}\right.\)

Chúc bạn học tốt!

mn giúp mik với

ai nhanh nhất mik cho 5 sao

nhanh hộ mik với

a) \(5^{x-1}+5^{x-3}=650\)

\(\Rightarrow5^x\left(\frac{1}{5}+\frac{1}{125}\right)=650\)

\(\Rightarrow5^x=650:\frac{26}{125}\)

\(\Rightarrow5^x=3125\)

\(\Rightarrow5^x=5^5\)

\(\Rightarrow x=5\)

|3x-1|=7/6

=>3x-1=-7/6 hoặc 7/6

=>3x=-1/6

=>x=-1/18

=>3x=13/6

=>x=13/18

b)5/3*|x-1/2|+1/3=4/3

=>5/3*|x-1/2|=1

=>|x-1/2|=3/5

=>x-1/2=-3/5 hoặc 3/5

=>x=-1/10

=>x=11/10