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tutu1155
@tutu1155
September 2021
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Помогите с 1,2,3,4 пожалуйста
Отмечу как лучший
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Pacanka202
1. 3)
2. 1) a–4=0 (не равно)
а не равно 4
2) 25х^2–49=0 (не равно)
(5х–7)(5х+7)=0
5х=7; 5х=-7
х=7/5; х=-7/5
х не равно 7/5 и -7/5
3. 1) 25х^5у^2 5х^2
-------------- = -------
35х^3у^3 7у
2) 3а 3a 3
--------- = --------- = ------
da+5a a(d+5) d+5
3) ab+3b b(a+3) a+3
--------- = --------- = -------
b^2 b^2 b
4) a^2–4 (a–2)(a+2)
---------- = --------------- = a–2
a+2 a+2
5) m^2–n^2 (m–n)(m+n) m–n
-------------- = ---------------- = --------
3m+3n 3(m+n) 3
6) a^2–m^2–2mn–n^2
------------------------------ =
8a–8m–8n
a^2–(m+n)^2 (a–m–n)(a+m+n)
= ------------------- = ----------------------- =
8(a–m–n) 8(a–m–n)
a+m+n
= -----------
8
4. 1) 8a^2b 3bc^2 24a^2b^2c^2
--------- • --------- = -------------------- =
9c 4a^3b 36a^3bc
2bc
= -------
3a
2) 12x^2y 168x^2z^2
24x^2 : ----------- = ---------------- =
7z^2 12x^2y
14z^2
= --------
y
3) a+2 b^2 (a+2)b^2 b
------ • ---------- = --------------- = -------
b a^2–4 b(a–2)(a+2) a–b
4) ab+b^2 b^2 b(a+b)•14a 2(a+b)
---------- : ------ = --------------- = --------
7a 14a 7ab^2 b
5) m+n m–n m+n
------- • ------- = -------
m–n m m
6) x x^2 3x(x–3) 3
------ : -------- = ------------ = ---
x–3 3x–9 (x–3)x^2 x
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Answers & Comments
2. 1) a–4=0 (не равно)
а не равно 4
2) 25х^2–49=0 (не равно)
(5х–7)(5х+7)=0
5х=7; 5х=-7
х=7/5; х=-7/5
х не равно 7/5 и -7/5
3. 1) 25х^5у^2 5х^2
-------------- = -------
35х^3у^3 7у
2) 3а 3a 3
--------- = --------- = ------
da+5a a(d+5) d+5
3) ab+3b b(a+3) a+3
--------- = --------- = -------
b^2 b^2 b
4) a^2–4 (a–2)(a+2)
---------- = --------------- = a–2
a+2 a+2
5) m^2–n^2 (m–n)(m+n) m–n
-------------- = ---------------- = --------
3m+3n 3(m+n) 3
6) a^2–m^2–2mn–n^2
------------------------------ =
8a–8m–8n
a^2–(m+n)^2 (a–m–n)(a+m+n)
= ------------------- = ----------------------- =
8(a–m–n) 8(a–m–n)
a+m+n
= -----------
8
4. 1) 8a^2b 3bc^2 24a^2b^2c^2
--------- • --------- = -------------------- =
9c 4a^3b 36a^3bc
2bc
= -------
3a
2) 12x^2y 168x^2z^2
24x^2 : ----------- = ---------------- =
7z^2 12x^2y
14z^2
= --------
y
3) a+2 b^2 (a+2)b^2 b
------ • ---------- = --------------- = -------
b a^2–4 b(a–2)(a+2) a–b
4) ab+b^2 b^2 b(a+b)•14a 2(a+b)
---------- : ------ = --------------- = --------
7a 14a 7ab^2 b
5) m+n m–n m+n
------- • ------- = -------
m–n m m
6) x x^2 3x(x–3) 3
------ : -------- = ------------ = ---
x–3 3x–9 (x–3)x^2 x