1) 35/39*11/40=77/312
2) 77/312:1 7/26=77/312:33/26=77/312*26/33=7/36
20+15 и 20-15, я так думаю...
1.
(√2 * 8²⁾³) / 2⁻¹⁾² =
= 2¹⁾² * (2³)²⁾³ : 2⁻¹⁾² =
= 2¹⁾² * 2² : 2⁻¹⁾² =
= 2¹⁾²⁺²⁻⁽⁻¹⁾²⁾ =
= 2¹⁾²⁺²⁺¹⁾² =
= 2³ = 8,
2.
(у¹⁾³)⁹⁾² / ⁴√у³ =
= у¹⁾³°⁹⁾² : у³⁾⁴ =
= у³⁾²⁻³⁾⁴ = у³⁾⁴ или ⁴√у³,
3.
а³⁾²в¹⁾²с³⁾² * а⁻¹⁾²в¹⁾²с⁻³⁾² =
= а³⁾²⁻¹⁾² * в¹⁾²⁺¹⁾² * с³⁾²⁻³⁾² =
= а¹ * в⁰ * с⁰ =
= а * 1 *1 = а
X^3+4x^2-12x+17=49=7^2 при х=-2
-8+16+24+17=8+41=49