Bài 8: Tìm x:
a) 71 - ( 33 + x ) = 26 g) 140 : ( x - 8 ) = 7
b) 45 - ( x + 9 ) : 2 = 6 h) 4 . ( x + 41 ) = 400
c) 2 . ( x + 7 ) - 25 = 13 i) 5 . ( x - 9 ) = 350
d) 2 . ( x - 51 ) = 2 . 2 mũ 3 + 20 j) 2x - 49 = 5 . 3 mũ 2
e) 450 : ( x - 19 ) = 50 k) 200 - ( 2x + 6 ) = 4 mũ 3
f) 10 - ( x - 3 ) : 2 = 7 ² - 1 mũ 10 l) 135 - 5 . ( x + 4 ) = 35