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0,65(9×4⁻²-2⁻⁴)⁻³=0,65(9×¹/₁₆ - ¹/₁₆)⁻³=0,65(⁸/₁₆)⁻³=0,65(½)⁻³=0,65×8=5,2
zad.2
0,7x=4×(1+2⁻²)+(⅓)⁻²
0,7x=4×1¼+9
0,7x=5+9
0,7x=14
x=20