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0,21 - x
0,21 *100 / 0,84 = 25%
5.
0,000 000 17 = 1,7 *10 do -7
Raczej tak ^^;D
Pozdro xD
0.21-x
x=0.21*100%/0.84
x=25%
2. 1.7*10 do -7