5⅝÷1⁷/₂₀-1¹³/₂₇×1¹⁹/₂₁=

5i5/8 : 1i 7/20-1i 13/15*1 19/21=45/8 : 27/20 - 18/15* 40/21= 4 5/8 *20/27-32/9= 25/6 - 32/9= 4i 1/6-3i 5/9 = 4i 3/18-3i10/18=3i21/18-3 i 10/18=1 i 11/18