1.zapisz wyrażenie w najprostrzej postaci ;
a)x^-3y^-2z^5/z^-2y^-3z^6
b)(x^-2y/z^3)^-3:(x^5y^-2/z^3)^-1
2.Wykonaj działanie;
a)3^-2/2^5*2^4/3^-1
b)7^-1(7^2+7^0)
c)1^-2+2^-2/(2/3)^-2+(-4)^-1*5+2^-2
/- to jest ułamek
^potęga
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zad 1
a) [x⁻³y⁻²z⁵]/[z⁻²y⁻³z⁶]=
=x⁻³y⁻²z⁵ * z²y³z⁻⁶=
=x⁻³ * y⁻²⁺³ * z⁵⁺²⁻⁶=
=x⁻³ * y¹ * z¹=
=yz/x³
[Potęga trzecia dotyczy tylo niewiadomej x w mianowniku]
---------------
b)
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zad 2
a) 3⁻²/2⁵ * 2⁴/3⁻¹=
=3⁻² * 2⁻⁵ * 2⁴ * 3¹=
=3⁻²⁺¹ * 2⁻⁵⁺⁴=
=3⁻¹ * 2⁻¹=
=(3*2)⁻¹=
=6⁻¹=
=1/6
---------------
b) 7⁻¹(7²+7⁰)=
=7⁻¹ * 7² + 7⁻¹ * 1=
=7⁻¹⁺² + 7⁻¹=
=7 + 1/7
=50/7
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c) [1⁻²+2⁻²]/(2/3)⁻² + (-4)⁻¹ * 5+2⁻²=
=[1 + 1/4] * (2/3)² + (-1/4) * 5 + 1/4=
=5/4 * 4/9 + (-5/4) + 1/4
=5/9 -1=
=-4/9