Đáp án+Giải thích các bước giải:
Bài 1:
$a)18:3^2+5.2^3\\=18:9+5.8\\=2+40\\=42$
$b)53.25+53.75\\=53.(25+75)\\=53.100\\=5300$
$c(-2012)-|-2013|+2012\\=(-2012+2012)-2013\\=0-2013\\=-2013$
Bài 2:
$a)12-2x=10\\2x=12-10\\2x=2\\x=2:2\\x=1$
$b)x+2013=2012\\x=2012-2013\\x=-1$
$c)6x^2-5:5=53\\6x^2-1=53\\6x^1=53+1\\6x^2=54\\x^2=54:6\\x^2=9\\<=>\left[ \begin{array}{l}x=3\\x=-3\end{array} \right.$
$d)|x|=|-10|\\|x|=10\\<=>\left[ \begin{array}{l}x=10\\x=-10\end{array} \right.$
