Tìm X:
a) ( X - 21 x 13 ) : 11 =30
b) (627 - 138 ) : ( x : 2 ) = 163
c) ( \(\frac{1}{2}\)+ X x \(\frac{9}{7}\)) : 2 ) = 163
d) ( 1 - \(\frac{3}{10}\)- X ) : (\(\frac{19}{10}\)- 1 - \(\frac{2}{5}\)) + \(\frac{4}{5}\)= 1
Ai lm nhanh mk cho 3 tik,5 phút sau lấy.