Question

помоги (1 2/3*2.1-4) :3/4-5/6

Answer 1

(5/3*21/10-4):3/4-5/6=(7/2-4):3/4-5/6=(7/2-8/2):3/4-5/6=-1/2:3/4-5/6=-1/2*4/3-5/6=-2/3-5/6=-4/6-5/6=-9/6=-1 3/6=-1 1/2 или -1,5

Answer 2

(1²/₃×2,1-4) : ³/₄-⁵/₆ = - 1,5
1) 1²/₃×2,1 = ⁵/₃ × ²¹/₁₀= ⁵ˣ²¹/₃ₓ₁₀ = ⁷/₂ = 3¹/₂ 
2) 3¹/₂- 4 = - ¹/₂
3) (-¹/₂) : ³/₄ =  (-¹/₂) × ⁴/₃ = - ¹ˣ⁴/₂ₓ₃ = - ²/₃
4) (-²/₃)-⁵/₆ = -²/₃-⁵/₆ = -⁴/₆-⁵/₆ = - ⁹/₆ = - 1³/₆ = - 1¹/₂ = - 1,5