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A) Do 34 < 36 nên 34³⁴ < 34³⁶
B) 1²⁰²³ = 1
2023⁰ = 1
Vậy 1²⁰²³ = 2023⁰
C) Do 45 < 47 nên 45²⁰²³ < 47²⁰²³
\(\left(7\dfrac{4}{9}+4\dfrac{7}{11}\right)-3\dfrac{4}{9}\)
\(=\dfrac{67}{9}+\dfrac{51}{11}-\dfrac{31}{9}\)
\(=\dfrac{67}{9}-\dfrac{31}{9}+\dfrac{51}{11}\)
\(=4+\dfrac{51}{11}\)
\(=\dfrac{95}{11}\)
Chúc bạn học tốt
Bài 3:
a) \(159-\left(25-x\right)=43\)
\(\Rightarrow25-x=159-43\)
\(\Rightarrow25-x=116\)
\(\Rightarrow x=25-116\)
\(\Rightarrow x=-91\)
b) \(\left(79-x\right)-43=-\left(17-52\right)\)
\(\Rightarrow\left(79-x\right)-43=-\left(-35\right)\)
\(\Rightarrow79-x=35+43\)
\(\Rightarrow79-x=78\)
\(\Rightarrow x=79-78\)
\(\Rightarrow x=1\)
c) \(-\left(-x+13-142\right)+18=55\)
\(\Rightarrow-\left(-x+13-142\right)=55-18\)
\(\Rightarrow x-13+142=37\)
\(\Rightarrow x+129=37\)
\(\Rightarrow x=37-129\)
\(\Rightarrow x=-92\)
\(a,\dfrac{7}{12}-\left(x+\dfrac{7}{10}\right):\dfrac{6}{5}=\dfrac{5}{4}\)
\(\Leftrightarrow\dfrac{7}{12}-x-\dfrac{7}{10}:\dfrac{6}{5}=\dfrac{5}{4}\)
\(\Leftrightarrow\dfrac{7}{12}-x-\dfrac{7}{12}=\dfrac{5}{4}\)
\(\Leftrightarrow\dfrac{7}{12}-x=\dfrac{5}{4}+\dfrac{7}{12}\)
\(\Leftrightarrow\dfrac{7}{12}-x=\dfrac{11}{6}\)
\(\Leftrightarrow x=\dfrac{7}{12}-\dfrac{11}{6}\)
\(\Leftrightarrow\dfrac{-5}{4}\)
có [x-y]2=1
suy ra [x-y]mũ 2= 1 mũ 2
suy ra x-1=1
x=1+1
x=2
\(2^4.5-\left[31-9^2\right]=16.5-\left(31-81\right)=80-\left(-50\right)=130\)
\(2^4\).5-[1.31-(13-4)^2]
=16.5-[1.31-81]
=16.5-[31-81]
=16.5-(-50)
=80-(-50)
=130
\(3\left(x-12\right)=0\\ \Rightarrow x-12=0\\ \Rightarrow x=12\)
⇔3x-36=0
⇔3x=36
⇔x=12
Vậy x=12