Oblicz :
a) ⅘-(1,2·⁵/₁₂-0,8):(-½)³=
b) 0,8:2³+(0,3)²=
c) (⅚-⅓·3⅓):(-1⅔)²=
d) (3,6+1,4·1¹/₇):(2-(-½)³=
e) 2,5+(⅔-1,8·⅚):(-⅓)³=
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a) ⅘-(1,2·⁵/₁₂-0,8):(-½)³=4/5+0,3:(-0,125)=0,8+0.175=0,975
b) 0,8:2³+(0,3)²=0,1+0,09=0,19
c) (⅚-⅓·3⅓):(-1⅔)²=(5/6-1/3*10/3):25/9=(5/6-10/9):25/9=(45/54-6/54):25/9
=(-15/54):25/9=(-5/18):25/9=(-5/18)*9/25=-45/450=-1/10=-0,1
d) (3,6+1,4·1¹/₇):(2-(-½)³=(18/5+7/5*1/7):(2+1/8)=(18/5+1/5):17/8=19/5:17/8
=19/5*8/17=152/85=1i67/85
e) 2,5+(⅔-1,8·⅚):(-⅓)³=5/2+(2/3-3/2):(-1/27)=-5/6:(-1/27)=-5/6*(-27/1)=
=135/6=22,5