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d) (2×⅚)² - (3²-√1siedem dziewiątych)=
e)[(-⅔)² : osiem dziewiątych]⁻¹=
f) 1,6×siedem szesnastych - 2,7 przez 3³=
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d) (2×⅚)² - (3²-√1siedem dziewiątych)= 25/9 - (9- Pierwiastek z 16/9)= 25/9 - (27/3 - 4/3)= 25/9 - 23/3= 50/18 - 117/18= - 67/18= -3 13/18
e) [(-2/3)^2 : 8/9]^-1= (4/9 * 9/8)^-1= (1/2)^-1= 2
f) 1,6 * 7/16 - 2,7: 3^3= 16/10 * 7/16 - 27/10 * 1/27= 7/10 - 1/10 = 6/10= 3/5