Question

помогите срочно с матешой даю 50 балов (140-142 упр) матем 6 класс

Answer 1

Ответ:

Пошаговое объяснение:

Answer 2

140.

1)

(х + 5,6) : 15 2/3 = 3,2 : 5 2/9,

(х + 5,6) : 15 2/3 = 32/10 : 47/9,

(х + 5,6) : 15 2/3 = 32/10 * 9/47,

(х + 5,6) : 15 2/3 = 288/470,

х + 5,6 = 288/470 * 15 2/3,

х + 5,6 = 288/470 * 47/3,

х + 5,6 = 96/10,

х + 5,6 = 9,6,

х = 9,6 - 5,6,

х = 4

2)

(16 - х) : 13 4/7 = 7/9 : 10 5/9,

(16 - х) : 13 4/7 = 7/9 : 95/9,

(16 - х) : 13 4/7 = 7/9 * 9/95,

(16 - х) : 13 4/7 = 7/95,

16 - х = 7/95 * 13 4/7,

16 - х = 7/95 * 95/7,

16 - х = 1,

х = 16 - 1,

х = 15,

141.

1)

(9 2/3 - х) : 3,5 = 17/35 : 102/100,

(9 2/3 - х) : 3,5 = 17/35 * 100/102,

(9 2/3 - х) : 3,5 = 10/21,

9 2/3 - х = 10/21 * 3,5,

9 2/3 - х = 10/21 * 35/10,

9 2/3 - х = 1 2/3,

х = 9 2/3 - 1 2/3,

х = 8,

2)

(6,5 + х) : 0,475 = 1 11/19 : 3/28,

(6,5 + х) : 0,475 = 30/19 * 28/3,

(6,5 + х) : 0,475 = 280/19,

6,5 + х = 280/19 * 0,475,

6,5 + х = 280/19 * 475/1000,

6,5 + х = 7,

х = 7 - 6,5,

х = 0,5,

142.

1)

(у - 8) / (11 4/7) = (8/27) / (5 1/3),

у - 8 = (11 4/7 * 8/27) : 5 1/3,

у - 8 = (81/7 * 8/27) : 16/3,

у - 8 = 24/7 * 3/16,

у - 8 = 9/14,

у = 9/14 + 8,

у = 8 9/14,

2)

(3/20) / (10/33) = (19 4/5) / (х - 15),

х - 15 = (10/33 * 19 4/5) : 3/20,

х - 15 = (10/33 * 99/5) * 20/3,

х - 15 = 40,

х = 40 + 15,

х = 55