1.a=2⅔-2,1*⁸⁄₂₁=8/3-21/10*8/21 = 8/3-4/5 = 40/15-12/15 = 28/15
Odwrotna 15/28
2.
⁴√5*25*√125*⁴√25 = 5^¼*5²*5^¼ = 5¹
625*√⅟₂₅*⁴√125 = 5⁴*5^⁻½*5^¾ = 5^17/4
5¹:5^¹⁷/₄ = 5^⁴/₄:5^¹⁷/₄ = 5^⁻¹³/₄
3.
2³√81-3³√24+³√375 = 2*3√3-3*2√3+5√3 = 6√3-6√3+5√3=5√3
5∛199-∛3000 = 5*∛199-10√2
4.
9,6*1000000=9600000
31*10000=310000
9600000-310000=9290000=9,29*10⁶
5.
[(6⁻¹+6⁻¹)⁻¹+6⁻¹]⁻¹ = [(2*6⁻¹)⁻¹+6⁻¹]⁻¹ = [⅓⁻¹+⅙]⁻¹ = [19/6]⁻¹ = 6/19
Oraz
{[(⅟₃)⁻¹+(⅟₃)⁻¹]⁻¹+(⅟₃)⁻¹}⁻¹ = {[3+3]⁻¹+3}⁻¹ = {19/6}⁻¹ = 6/19
Liczy są równe