Question

Oblicz 20% wyrażenia 4/5-(1,2:5/12-0,8):(-1/2)^3

Answer 1

4/5-(1,2:5/12-0,8):(-1/2)³=4/5-(6/5·12/5-4/5):(-1/8)=4/5-(72/25-4/5):(-1/8)=
4/5-(72/25-20/25):(-1/8)=4/5-52/25·(-8)=4/5-(416/25)=20/25+416/25=436/25
zatem 436/25=17,44 


zatem 20% tego wyrazenia wynosi:
20%·17,44=3,488

Answer 2

4/5-(1,2:5/12-0,8):(-1/2)^3= 4/5-(12/10*12/5-0,8):(-1/8)=4/5-(144/50-40/50)*(-8/1)= 4/5+104/50*8=40/50+836/50=876/50=17 26/50= 17,52


17,52 ---- 100%
X       ----- 20%

(17,52:100)*20=3,504