Выберите из чисел 14, 21, 31, 42, 51, 63, 68, 75 те, которые: а) кратные 7; б) кратные 17; в) не кратные 8; г) не кратные 2.
30 ’
236
272
Ответы на вопрос:
1. i do not study french. 2. school does not finish at two o´clock. 3. you do not copy from other students. 4. we do not think english is easy. 5. my friends do not play volleyball. 6. i do not watch tv on saturday morning. 7. she does not speak chinese. 8. the dog does not like cats. 9. they do not listen to pop music. 10. i do not play with my hamster every day.
кратные на 7 : 14,21,42,63
коратные на17: 51.68
не кр на 8: 14,21,31,42,51,63,68,75
не кр на 2 : 21,31,51.63.75
{2(3x + 2y) + 9 = 4x + 21 { 2x + 10 = 3 - (6x + 5y) {6x + 4y + 9 = 4x + 21 { 2x + 10 = 3 - 6x - 5y { 6x + 4y - 4x = 21 - 9 { 2x + 6x + 5y = 3 - 10 { 2x + 4y = 12 { 8x + 5y = - 7 { 2(x + 2y) = 12 |: 2 { 8x + 5y = - 7 { x + 2y = 6 { 8x + 5y = - 7 { x = 6 - 2y { 8x + 5y = - 7 способ подстановки: 8(6 - 2y) + 5y = - 7 48 - 16у + 5у = -7 48 -11у = -7 - 11у = -7 -48 - 11у = -55 у = (-55) : ( - 11) у = 5 х = 6 - 2* 5 = 6 - 10 х = - 4 ответ : ( - 4 ; 5 ).
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