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(-0,2)⁻³=1/-0,2³=1/-0,008=-125
9^1/2=x /( )²
9=x²
x=3
27^-1/3=x /( )³
27⁻¹=x³
x³=1/27
x=1/3
8^¾=x /( )⁴
8³=x⁴
x⁴=512
x≈4,8
(3⅜)^4/3=(27/8)^4/3=(3³/2³)^4/3=3⁴/2⁴=1,5⁴=15⁴/10⁴=50625/10000=5.0625
3.
po uproszczeniu wyjdzie
-10x² +7x +3
a po podstawieniu
-1000 - 70 + 3=-1067