Предмет: Математика, автор: BORFF

Помогите пжжж срочно за 55 балов

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Ответы

Автор ответа: MolkyWay
0

Ответ:

1) (3\frac{1}{3} + 5\frac{1}{6} )*\frac{2}{5} -2\frac{3}{4} /(1\frac{1}{2} -\frac{2}{5} )=(3\frac{2}{6} +5\frac{1}{6} )*\frac{2}{5} -2\frac{3}{4} /(1\frac{5}{10} -\frac{4}{10} )=8\frac{3}{6} *\frac{2}{5} -\frac{11}{4} /1\frac{1}{10}=\frac{51}{6}  *\frac{2}{5} -\frac{11}{4} *\frac{10}{11} =\frac{102}{30} -\frac{10}{4} =\frac{204-150}{60} =\frac{54}{60} =\frac{9}{10} =0,9

2)3\frac{1}{3} *2\frac{2}{5} +(2-4\frac{8}{15} *\frac{3}{17} )=\frac{10*12}{3*5} +(2-\frac{68*3}{15*17} )=2*4+(2-\frac{4}{5} )=8+1,2=9,2

3)(\frac{1}{8} +\frac{2}{9} -\frac{1}{4} )*5\frac{1}{7} /(\frac{7}{9} -\frac{2}{3}  +\frac{1}{6} )=(\frac{9+16+18}{72} )*\frac{36}{7} /(\frac{14-12+3}{18} )=\frac{43}{72} *\frac{36}{7} *\frac{18}{5} =\frac{43*36}{4*7*5} =\frac{9*43}{7*5} =\frac{387}{35} =11\frac{2}{35}

4)(10\frac{3}{4} -12/1\frac{1}{5} )*\frac{4}{9} +2\frac{1}{6} +3\frac{1}{4} /5\frac{1}{5} =(\frac{43}{4} -\frac{12*5}{6} )*\frac{4}{9} +\frac{13}{6} +\frac{13*5}{4*26} =(\frac{43}{4} -10)*\frac{4}{9} +\frac{13}{6} +\frac{5}{2*4} =\frac{3}{4} *\frac{4}{9} +\frac{13}{6} +\frac{5}{8} =\frac{1}{3} +\frac{13}{6} +\frac{5}{8} =\frac{2+13}{6} +\frac{5}{8} =\frac{15}{6} +\frac{5}{8} =\frac{60+15}{24} =\frac{75}{24} =\frac{25}{8} =3\frac{1}{8}

Автор ответа: iramazurk
0

Ответ:

Пошаговое объяснение:

1.

1) 3. 1/3 + 5. 1/6 = 3. 2/6 + 5. 1/6 = 8. 3/6 = 8. 1/2

2) 8. 1/2 * 2/5 = 17/2 * 2/5 = 17/5 = 3. 2/5

3) 1. 1/2 - 2/5 = 1. 5/10 - 4/10 = 1. 1/10

4) 2. 3/4 : 1. 1/10 = 11/4 : 11/10 = 11/4 * 10/11 = 10/4 = 2. 2/4 = 2. 1/2

5) 3. 2/5 - 2. 1/2 = 3. 4/10 - 2. 5/10 = 2. 14/10 - 2. 5/10 = 9/10

2.

1) 3. 1/3 * 2. 2/5 = 10/3 * 12/5 = 2/1 * 4/1 = 8/1 = 8

2) 4. 8/15 * 3/17 = 68/15 * 3/17 = 4/5 * 1/1 = 4/5

3) 2 - 4/5 = 1. 5/5 - 4/5 = 1. 1/5

4) 8 + 1. 1/5 = 9. 1/5

3.

1) 1/8 + 2/9 - 1/4 = 9/72 + 16/72 - 18/72 =

7/72

2) 7/9 - 2/3 + 1/6 = 14/18 - 12/18 + 3/18 =

5/18

3) 7/72 * 5. 1/7 = 7/72 * 36/7 = 36/72 = 1/2

4) 1/2 : 5/18 = 1/2 * 18/5 = 1/1 * 9/5 = 9/5 =

1. 4/5

4.

1) 12 : 1. 1/5 = 12 : 6/5 = 12 * 5/6 = 60/6 = 10

2) 10. 3/4 - 10 = 3/4

3) 3/4 * 4/9 = 3/9 = 1/3

4) 3. 1/4 : 5. 1/5 = 13/4 : 26/5 = 13/4 * 5/26 = 1/4 * 5/2 = 5/8

5) 1/3 + 2. 1/6 + 5/8 = 8/24 + 2. 4/24 + 15/24 = 2. 27/24 = 3. 3/24 = 3. 1/8

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