Comments on: 1) 123-(8x-11)*2=492) 51/(4y-9)=173) (18+5x)/11=3 https://ukrreferat.com/questions/1-123-8x-11-2-492-51-4y-9-173-18-5x-11-3 Реферати Українською, курсові, дипломи - скачати безкоштовно на UkrReferat.com Fri, 11 Oct 2019 00:00:16 +0300 hourly 1 https://wordpress.org/?v=4.9.29 By: Субботина Татьяна https://ukrreferat.com/questions/1-123-8x-11-2-492-51-4y-9-173-18-5x-11-3#comment-1335 Sun, 26 May 2019 00:00:12 +0000 https://ukrreferat.com/%d0%b1%d0%b5%d0%b7-%d1%80%d1%83%d0%b1%d1%80%d0%b8%d0%ba%d0%b8/1-123-8x-11-2-492-51-4y-9-173-18-5x-11-3.html#comment-1335 Раскроем скобки и сведем подобные слагаемые:

1) 123 – (8x – 11) * 2 = 49;

123 – 2 * 8x + 2 * 11 = 49;

123 – 16x + 22 – 49 = 0;

145 – 49 – 16x = 0;

96 – 16x = 0;

– 16x = – 96;

16x = 96;

x = 96 : 16;

x = 6.

Ответ: 6.

2) 51/(4y – 9) = 17;

51 = 17 * (4y – 9);

51 = 17 * 4y – 17 * 9;

51 = 68y – 153;

51 + 153 = 68y;

204 = 68y;

y = 204 : 68;

y = 3.

Ответ: 3.

3) (18 + 5x)/11 = 3;

18 + 5x = 3 * 11;

18 + 5x = 33;

5x = 33 – 18;

5x = 15;

x = 15 : 5;

x = 3.

Ответ: 3.

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