( 2x - 1 ) \(^4\) = 16

=> ( 2x - 1 ) \(^4\) = 2 \(^4\)

=> 2x  - 1 = 2 \(^{4:4}\)

=> 2x - 1 = 2

=> 2x = 2 + 1

=> 2x = 3

=> x = 3 : 2

=> x = 1,5

10${}^{10}$ - 1 = 10000000000 - 1 = 9999999999 : 9 = 1111111111

10^{33}3\(^{33}\) + 8 = 100000000000000000000000000000000 + 8 = 10000000000000000000000000000000008 :9 = 11111111111111111111111111111112 ;10000000000000000000000000000000008 thì 8: cho 2 = 4 

còn chia hết cho 9 thì chia hết cho 3

10\(^{10}\) - 1 = 10000000000 - 1 = 9999999999 : 9 = 1111111111

10\(^{33}\) + 8 = 100000000000000000000000000000000 + 8 = 10000000000000000000000000000000008 :9 = 11111111111111111111111111111112

107 - { 38 + [ 7 . 9 - 24 : 6 + 2\(^3\) ] } : 15

107 - { 38 + [ 63 - 4 +8 ] } : 15

107 - { 38 + [ 59 + 8 ] } : 15

107 - { 38 + 67 } : 15 

107 - 105 : 15

107- 7 = 100

abcd5=a.10000+b.1000+c.100+d.10+5

0,75