Предмет: Математика, автор: nasaraiamari59

решите номер 447 пожалуйста все столбики полностью а не только ответ пжжж я подпишусь ​

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Ответы

Автор ответа: dikov66666
1

1.7(х+6)=49

7х+42=49

7х=-42+49

7х=7

х=7:7

х=1

15(х-10)=255

15х-150=255

15х=150+255

15х=405

х=405:15

х=27

27(19-х)=324

513-27х=324

-27х=-513+324

-27х=-189

х=-189:(-27)

х=7

2.3(2х-9)=27

6х-27+27

6х=27+27

6х=54

х=54:6

х=9

9(5х+8)=207

45х+72=207

45х=-72+207

45х=135

х=135:45

х=3

19(39-2х)=703

741-38х=703

-38х=-741+703

-38х=-38

х=-38:(-38)

х=1

3.2(2х+3х)=20

4х+6х=20

10х=20

х=20:10

х=2

7(3х-х)=42

21х-7х=42

14х=42

х=42:14

х=3

12(х+9х)=1200

12х+108х=1200

120х=1200

х=1200:120

х=10

nasaraiamari59: не поняла самый первый.
dikov66666: вы перемножаете число которое стоит за скобкой на все те числа, которые записаны в скобке. После, иксы нужно переносить в левую сторону, а остальные числа в правую. После проведения вычеслительных операций вы делите число без иксов на число, где были записаны иксы, но сам икс вы переносите в самую переднюю часть и после ставите равно. Итого икс будет равен число с правой стороны поделить на число с левой стороны. Можете дополнительно посмотреть видеоуроки на ютубе, если вам не ясна тема.
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