Question

Срочнооо 7 класс пж алгебраа​

Answer 1

Ответ:

$1)\displaystyle3\frac{1}{9} :2\frac{1}{3} -2\frac{5}{6} =\frac{28}{9} *\frac{3}{7} -\frac{17}{6} =\frac{4}{3} -\frac{17}{6} =\frac{8}{6} -\frac{17}{6} =-\frac{9}{6} =-\frac{3}{2} =-1.5$

$2)\displaystyle1\frac{5}{7} -4\frac{3}{13} :1\frac{19}{26} =\frac{12}{7} -\frac{55}{13} *\frac{26}{45} =\frac{12}{7} -\frac{22}{9} =\frac{108}{63} -\frac{154}{63} =-\frac{46}{63}$

$3)\displaystyle10\frac{16}{17} :8\frac{5}{11} +1\frac{2}{3} =\frac{186}{17} *\frac{11}{93} +\frac{5}{3} =\frac{22}{17} +\frac{5}{3} =\frac{66}{51} +\frac{85}{51} =\frac{151}{51}$

$4)\displaystyle\frac{47}{48} :3\frac{11}{27} -\frac{13}{16} =\frac{47}{48} *\frac{27}{92} -\frac{13}{16} =\frac{423}{1472} -\frac{13}{16} =\frac{423}{1427} -\frac{1196}{1427} =-\frac{773}{1427}$

Answer 2

Объяснение:

№1

1) 3. 1/9 : 2. 1/3 = 28/9 : 7/3 = 28/9 * 3/7 = 4/3 * 1/1 = 4/3 = 1. 1/3

2) 1. 1/3 - 2. 5/6 = 1. 2/6 - 2. 5/6 = -1. 3/6 = -1. 1/2

№2

1) 4. 3/13 : 1. 19/26 = 55/13 : 45/26 = 55/13 * 26/45 = 11/1 * 2/9 = 22/9 = 2. 4/9

2) 1. 5/7 - 2. 4/9 = 1. 45/63 - 2. 28/63 = 1. 45/63 - 1. 91/63 = -46/63

№3

1) 10. 16/17 : 8. 5/11 = 186/17 : 93/11 = 186/17 * 11/93 = 2/17 * 11/1 = 22/17 = 1. 5/17

2) 1. 5/17 + 1. 2/3 = 1. 15/51 + 1. 34/51 = 2. 49/51

№4

1) 47/48 : 3. 13/27 = 47/48 : 94/27 = 47/48 * 27/94 = 1/16 * 9/2 = 9/32

2) 9/32 - 13/16 = 9/32 - 26/32 = -17/32