20 - (7 1/3 - 6 7/8) : 3/4 - (5 1/4 - 4 21/40) : 1 9/20

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23 февраля, 06:01

20 - (7 1/3 - 6 7/8) : 3/4 - (5 1/4 - 4 21/40) : 1 9/20

+4

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Алинка · Answer 1

20 - (7 1/3 - 6 7/8) : 3/4 - (5 1/4 - 4 21/40) : 1 9/20 = 18 8/9

1) 7 1/3 - 6 7/8 = 22/3-55/8 = (176-165) / 24 = 11/24

2) 5 1/4 - 4 21/40 = (210 - 181) / 40 = 29/40

3) 11/24 : 3/4 = 11*4/24*3 = 11*1/6*3=11/18

4) 29/40 : 1 9/20 = 29/40 : 29/20 = 29/40 * 20/29 = 2/4=1/2

5) 20 - 11/18 = 19 7/18

6) 19 7/18 - 1/2 = 19 7/18 - 9/18 = 18 16/18 = 18 8/9

Элюня · Answer 2

20 - (7 1/3 - 6 7/8) : 3/4 - (5 1/4 - 4 21/40) : 1 9/20 =

= 20 - (22/3 - 55/8) * 4/3 - (21/4 - 181/40) * 20/29 =

= 20 - 11/24 * 4/3 - 29/40 * 20/29 =

= 20 - 11/18 - 1/2 =

= 20 - 11/18 - 9/18 =

= 20 - 20/18 =

= 20 - 1 1/9 = 18 8/9