Răspuns:
Explicație pas cu pas:
-³⁾3/7 - 20/21 = -9/21 - 20/21 = -29/21 = -1 intreg si 8/21
⁴⁾5/6 - ³⁾3/8 = 20/24 - 9/24 = 11/24
2si5/8 -3si5/6 = ³⁾21/8 - ⁴⁾23/6 = 63/24 - 92/24 = -29/24 = -1 intreg si 5/4
-1si3/4 + 2si7/8 = -²⁾7/4 + 23/8 = -14/8 + 23/8 = 9/8 = 1 intreg si 1/8
