405=100% => 1%=405\100=4.05
332 - 332/4.05 = 81.975%
23 - 23/4.05 = 5.679%
12 - 12/4.05 = 2.963%
38 - 38/4.05 = 9.383%
9- 2 ²/₁₅ * 3 ¹/₈=9 - ³²/₁₅ * ²⁵/₈=9 - ⁴/₃ * ⁵/₁=9 - ²⁰/₃ = ²⁷/₃ - ²⁰/₃=⁷/₃ = 2 ¹/₃
3* ¹/₂ - 2 ¹/₂ : 1,25=³/₂ - ⁵/₂ : ⁵/₄=³/₂ - ⁵/₂ * ⁴/₅ = ³/₂ - 2 = ³/₂ - ⁴/₂ = - ¹/₂
0,8х*125у^3+ 4х^3*у^4 - ху^2*4x^2*у^2= 100ху^3+ 4х^3у^4 - 4х^3у^4 = 100х*у^3= 100*(-16)*(1/4)^3= 100*(-16)*(1/64)= -1600/64= -25