Question

757. Являются ли тождественно равными выражения: 1) 15 + 2а - 3 и 12 + 2а; 2) 4,7 — аиа — 4,7;3) (1,5a) - (26) и 30ab;4) (40x) : уи (5x) : (8y)?Помогите пожалуйста!!!(:<​.

Answer 1

Ответ:

Пошаговое объяснение:

тождественно равными являются только выражения:

1) 15 + 2а - 3 и 12 + 2а; Их разность равна нулю.

Answer 2

Ответ:

1 - Является

2 - Не является

3 - Не является

4 - Не является

Пошаговое объяснение:

1) 15+2а-3=15-3+2а=12+2а ⇒ Является!

2) 4,7-а и а-4,7

4,7+4,7=а-а

9,4≠0 ⇒ Не является!

3) (1,5a)-(26)=1,5а-26

1,5а-26≠30ab ⇒ Не является!

4) (40х):у=40:у*х:у

40:у*х:у≠(5х):(8у) ⇒ Не является!

Answer 3

1) To determine if the expressions are identical, we need to simplify and compare them. Let's simplify the expressions:

Expression 1: 15 + 2a - 3 Expression 2: 12 + 2a

To compare the two expressions, we can start by combining like terms:

Expression 1: 2a + 12 - 3 Expression 2: 2a + 12

Now, we can see that both expressions have the same terms, 2a and 12. Therefore, the expressions are identically equal.

2) Let's simplify the second set of expressions:

Expression 1: 4.7 - a - 4.7 Expression 2: 0

Here, we can see that the first expression simplifies to 0, which is the same as the second expression. Therefore, the expressions are identically equal.

3) Now, let's simplify the third set of expressions:

Expression 1: 1.5a - 26 + 30ab Expression 2: 40x + uy + 8y

These expressions involve different variables, so we cannot directly compare them. Therefore, the expressions are not identically equal.

4) Finally, let's simplify the fourth set of expressions:

Expression 1: 40x / u + 5x + 8y Expression 2: 40x / u + 5x + 8y

Here, we can see that both expressions are exactly the same. Therefore, the expressions are identically equal.

To summarize: 1) The expressions 15 + 2a - 3 and 12 + 2a are identically equal. 2) The expressions 4.7 - a - 4.7 and 0 are identically equal. 3) The expressions 1.5a - 26 + 30ab and 40x + uy + 8y are not identically equal. 4) The expressions 40x / u + 5x + 8y and 40x / u + 5x + 8y are identically equal.

I hope this helps! Let me know if you have any further questions.