Предмет: Математика, автор: milanameiramchanova

помогите пожалуйста ​

Приложения:

Znaniya3000iq: А 14/5 б 2/3 в1/5

Ответы

Автор ответа: Veroni4ka777
1

Ответ:

Пошаговое объяснение:

а. 2×(14/15)×(3/2)=2×(7/5)=14/5=2_4/5

б. (12/11 ×(4/3)×(11/24)=1/2×(4/3)=2/3

в. все сокращаеся по диагонали и остается 1/5=0,2




milanameiramchanova: спч
milanameiramchanova: спс
Автор ответа: danik10101
0

Відповіді: 14/5, 2/3, 1/5.

Покрокове пояснення:

x:\frac{a}{b} = x\times\frac{b}{a}\\\frac{a}{b}\times\frac{c}{d} = \frac{ac}{bd}\\\frac{ac}{bc} = \frac{a}{b}

а) 2\left(\frac{14}{15}:\frac23\right) = 2\left(\frac{14}{15}\times\frac32\right) = 2\left(\frac{14\times3}{15\times2}\right) = \frac{2\times14\times3}{15\times2} = \frac{14\times3}{15} = \frac{14\times3}{3\times5} = \frac{14}{5} = 2.8

б) \frac{12}{11}:\frac34\times\frac{11}{24} = \frac{12}{11}\times\frac43\times\frac{11}{24} = \frac{12\times4\times11}{11\times3\times24} = \frac{12\times4}{3\times12\times2} = \frac{2\times2}{3\times2} = \frac{2}{3} = 0.\overline{66}

в) \frac12\times\frac23\times\frac34\times\frac45 = \frac{1\times2\times3\times4}{2\times3\times4\times5} = \frac{1\times2\times4}{2\times4\times5} =  \frac{1\times4}{4\times5} = \frac15 = 0.2

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