√1 ⁷/₉= e)[(-2/3)²:8/9]⁻¹= f)1,6×7/16-2,7/3³=

e)[(-2/3)²:8/9]⁻¹=[4/9 : 8/9]⁻¹=(4/9 x 9/8)⁻¹=(36/72)⁻¹=72/36=2 f)1,6×7/16-2,7/3³=1,6x7:16-2,7:27=11,2:16-0,1=112/10x1/16-1/10=7/10x1/1-1/10=7/10-1/10=6/10=3/5