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to problems 30..39
to problems 50..59
40.
Solve x in:
(base of logarithm is 10)


41.
If:

calculate x-y

42.
Below squares are pictured.
The red area is 20.
How big is the blue area?.


43.
find values of x satisfying:


44.
Calculate the value of


45.
Calculate:


46.
Find x if :

47.
If

calculate


48.
x + y = 2
x5 + y5 = 82
Calculate x and y

49.
For which values of x is true:


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