(9,4 +1 целая 17/20)/1 целая 7/8 +243/8=? (15целых1/3 - 8 целых5/18)2целых4/7/6целых 1/21- 2 целых5/8=?

Ответы

slavka30 21.07.2020 20:27

(9,4 +1¹⁷/₂₀) : 1⁷/₈ + 24 × ³/₈ = 15
9,4 +1¹⁷/₂₀ = ⁹⁴/₁₀ + ³⁷/₂₀ = ⁹⁴ˣ²/₂₀ + ³⁷/₂₀ = ¹⁸⁸/₂₀ + ³⁷/₂₀ = ¹⁸⁸⁺³⁷/₂₀ =²²⁵/₂₀
²²⁵/₂₀ : 1⁷/₈ = ²²⁵/₂₀ : ¹⁵/₈ = ²²⁵/₂₀ × ⁸/₁₅ = ²²⁵ˣ⁸/₂₀ₓ₁₅ = ²⁴/₄ = 6
24 × ³/₈ = ²⁴/₁ × ³/₈ = ²⁴ˣ³/₁ₓ₈ = ³ˣ³/₁ = ⁹/₁ = 9
9 + 6 = 15

(15¹/₃ - 8⁵/₁₈) × 2⁴/₇ : 6¹/₂₁ - 2⁵/₈ = 0,375
15¹/₃ - 8⁵/₁₈ =⁴⁶/₃ - ¹⁴⁹/₁₈ =⁴⁶ˣ⁶/₁₈ - ¹⁴⁹/₁₈ = ²⁷⁶/₁₈ - ¹⁴⁹/₁₈ = ²⁷⁶⁻¹⁴⁹/₁₈= ¹²⁷/₁₈
¹²⁷/₁₈ × 2⁴/₇ = ¹²⁷/₁₈ × ¹⁸/₇ = ¹²⁷ˣ¹⁸/₁₈ₓ₇ = ¹²⁷/₇
¹²⁷/₇ : 6¹/₂₁= ¹²⁷/₇ : ¹²⁷/₂₁ = ¹²⁷/₇ × ²¹/₁₂₇= ¹²⁷ˣ²¹/₇ₓ₁₂₇ = ²¹/₇ = 3
3 - 2⁵/₈ = ³/₈ = 0,375

ПОКАЗАТЬ ОТВЕТЫ

dhrgdh 21.07.2020 20:27

1)
$(9,4+1 \frac{17}{20} ):1 \frac{7}{8} +24* \frac{3}{8} =15$
1) $9,4+1 \frac{17}{20} =9,4+1,85=11,25$
2) $11,25:1 \frac{7}{8} =11 \frac{1}{4} :1 \frac{7}{8} = \frac{45}{4} * \frac{8}{15}=\frac{3}{1} * \frac{2}{1}=6$
3) $24* \frac{3}{8}=9$
4) 6+9=15

2)
$(15 \frac{1}{3} - 8 \frac{5}{18} )*2 \frac{4}{7} : 6 \frac{1}{21} - 2 \frac{5}{8} =\frac{3}{8}$
1) $15 \frac{1}{3} - 8 \frac{5}{18}=15 \frac{6}{18} -8 \frac{5}{18}=7 \frac{1}{18}$
2) $7 \frac{1}{18} *2 \frac{4}{7}= \frac{127}{18} * \frac{18}{7}= \frac{127}{7}=18 \frac{1}{7}$
3) $18 \frac{1}{7} : 6 \frac{1}{21}= \frac{127}{7} : \frac{127}{21}= \frac{127}{7} * \frac{21}{127}=3$
4) $3 - 2 \frac{5}{8} = \frac{3}{8}$