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$\textbf{Bài 1a}$
$\{[216-(36-31)^3\cdot2]-9\}\cdot1001$
$=\{216-5^3\cdot2-9\}\cdot1001$
$=(216-250-9)\cdot1001$
$=(-43)\cdot1001$
$=-43043.$
$\textbf{Bài 1b}$
$\{315-[(60-41)^2-361]\cdot4217\}+2885$
$=\{315-(19^2-361)\cdot4217\}+2885$
$=\{315-(361-361)\cdot4217\}+2885$
$=315+2885$
$=3200.$
$\textbf{a)}$
$\{[261-(36-3)\cdot3^2]-9\}\cdot1001$
$=\{261-33\cdot9-9\}\cdot1001$
$=(261-297-9)\cdot1001$
$=-45\cdot1001$
$=-45045.$
$\textbf{b)}$
$\{315-[(660-41)^2-361]\cdot4217\}+2885$
$=\{315-(619^2-19^2)\cdot4217\}+2885$
$=\{315-(619-19)(619+19)\cdot4217\}+2885$
$=\{315-600\cdot638\cdot4217\}+2885$
$=3200-1613691600$
$=-1613688400.$
$\textbf{A}$
$A=[261-(36-31)^3\cdot2]-9\cdot1001$
$=[261-5^3\cdot2]-9009$
$=[261-125\cdot2]-9009$
$=(261-250)-9009$
$=11-9009$
$=-8998.$
$\textbf{B}$
$B=\{315-[(60-41)^2-361]\cdot4217\}+2885$
$=\{315-(19^2-361)\cdot4217\}+2885$
$=\{315-(361-361)\cdot4217\}+2885$
$=315-0+2885$
$=3200.$
a.\(\left[545-\left(45+4.25\right)\right]:50-2000:250+2^{15}:2^{13}\)
=\(\left[545-145\right]:50-8+2^2\)
=\(400:50-8+4\)
=8-8+4
=4
b.\(\left[504-\left(25.8+70\right)\right]:9-15+9^0\)
=\(\left[504-270\right]:9-15+1\)
=234:9-14
=26-14
=12
Ta có : (6 - x)2014 = (6 - x)2015
=> (6 - x)2014 - (6 - x)2015 = 0
<=> (6 - x)2014(1 - 6 - x) = 0
<=> \(\orbr{\begin{cases}\left(6-x\right)^{2014}=0\\1-6-x=0\end{cases}}\)
<=> \(\orbr{\begin{cases}6-x=0\\-5-x=0\end{cases}}\)
<=> \(\orbr{\begin{cases}x=6\\x=-5\end{cases}}\)
sory bạn trừng hợp hai mk nhầm :
1 - (6 - x) = 0
=> 1 - 6 + x = 0
=> -5 + x = 0
=> x = 5
$\textbf{a)}$
$\{[126-(36-31)^2\cdot2]-9\}\cdot1001$
$=\{126-5^2\cdot2-9\}\cdot1001$
$=(126-50-9)\cdot1001$
$=67\cdot1001$
$=67067.$
$\textbf{b)}$
$\{315-[(60-41)^2-361]\cdot4217\}+2885$
$=\{315-(19^2-361)\cdot4217\}+2885$
$=\{315-(361-361)\cdot4217\}+2885$
$=315+2885$
$=3200.$
$\textbf{c)}$
$[(46-32)^2-(54-42)^2]\cdot36-1872$
$=(14^2-12^2)\cdot36-1872$
$=(14-12)(14+12)\cdot36-1872$
$=2\cdot26\cdot36-1872$
$=52\cdot36-1872$
$=1872-1872$
$=0.$
$\textbf{d)}$
$[(14+3)\cdot2-5]\cdot91-325$
$=(17\cdot2-5)\cdot91-325$
$=(34-5)\cdot91-325$
$=29\cdot91-325$
$=29(100-9)-325$
$=2900-261-325$
$=2314.$