Bài 6. Tìm x
a) ) x3.x2+ 8=40
b) (x3- 8)(6x – 1) = 0
c)
d) 5x+2-12.4=77
e) 649 - ( 2x - 3)3 . 5 = 3 . 23
g) (x – 2)2 - 32 = 16
h) (x + 5). (x - 9) = 0
i)52.x+72.x=242-40:2
k) 7x + 7x+2 = 49 .50
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