Giúp mik vs ạ. Cảm ơn
mn giúp mik vs ạ mik cảm ơn ạ
Bài 2:
b: f(0)=5
f(-1)=8
f(-3)=14
mn giúp mik vs ạ, mik cảm ơn ạ
Giúp mik vs ạ mik cảm ơn nhiều ạ
a) \(6x^2-8x=2x\left(3x-4\right)\)
b) \(21x^2y^7-12x^5y^3=3x^2y^3\left(7y^4-4x^3\right)\)
c) \(4x^2y-6xy^2=2xy\left(2x-3y\right)\)
d) \(24x^2y-18xy^2=6xy\left(4x-3y\right)\)
e) \(9x^2y^2+12x^2y-15xy^2=3xy\left(3xy+4x-5y\right)\)
f) \(x\left(x+y\right)+y\left(-x-y\right)=x\left(x+y\right)-y\left(x+y\right)=\left(x+y\right)\left(x-y\right)\)
g) \(3\left(x+y\right)+x\left(x+y\right)=\left(x+y\right)\left(x+3\right)\)
h) \(3x\left(x-y\right)-6y\left(y-x\right)=3x\left(x-y\right)+6y\left(x-y\right)=3\left(x-y\right)\left(x+2y\right)\)
Giúp mik vs ạ mik cảm ơn nhiều ạ
Giúp mik vs ạ mik cảm ơn nhiều lắm ạ
beautifully
excitedly
interesting
collected
arrangements
peacefully
excited
different
Giúp mik vs ạ mik cảm ơn nhiều lắm ạ
a,\(x^2-7x+6=x^2-x-6x+6\)
\(=x\left(x-1\right)-6\left(x-1\right)\)
\(=\left(x-6\right)\left(x-1\right)\)
a) x2-7x+6=(x2-x)-(6x-6)=x(x-1)-6(x-1)=(x-6)(x-1)
b) x2-6x+3=(x2-6x+9)-6=(x-3)2-\(\sqrt{6^2}\)=(x-3-\(\sqrt{6}\))(x-3+\(\sqrt{6}\))
c) x2-4x+3=(x2-x)-(3x-3)=x(x-1)-3(x-1)=(x-3)(x-1)
d) 3x2-5x+2=(3x2-3x)-(2x-2)=3x(x-1)-2(x-1)=(3x-2)(x-1)
e) 7x2-x-6=(7x2-7x)+(6x-6)=7x(x-1)+6(x-1)=(7x+6)(x-1)
f) 3x2-5x-8=(3x2+3x)-(8x+8)=3x(x+1)-8(x+1)=(3x-8)(x+1)
g) x2-6x+5=(x2-x)-(5x-5)=x(x-1)-5(x-1)=(x-5)(x-1)
h) x2-2x-3=(x2-2x+1)-4=(x-1)2-22=(x-1-2)(x-1+2)=(x-3)(x+1)
i) x2-x-12=(x2+3x)-(4x+12)=x(x+3)-4(x+3)=(x-4)(x+3)
Sxem giúp mik coi có sai vs lamf giúp mik câu 27 vs ạ mik cảm ơn
27. unforgetable
câu 31 đổi thành ...if I can give him his guide....
câu 32 thiếu on trong turned on và đổi thành has been turned on vì câu gốc là HTHT
câu 33 rút gọn mệnh đề ok
câu 34 hơi phân vân nhưng mình thấy đúng
Mik đang cần gấp giúp mik giải vs ạ! Mik cảm ơn ạ!
1 are
2 am
3 is
4 are
5 are
6 are
7 is
8 is
9 is
10 are
IV
1 is writing
2 are losing
3 is having
4 is staying
5 am not lying
6 is always using
7 are having
8 Are you playing
9 are not touching
10 Is - listening
11 Is- winning
12 am not staying
13 is not working
14 is not reading
15 isn't raining
16 am not listening
17 Are they making
18 Are you doing
19 Is - sitting
20 is - doing
21 are-putting
22 are-wearing
23 is-studying
2, am
3, is
4,are
5,are
6,are
7,is
8,is
9,is
10,are
IV
1,2,7 OK
3,is having
4,has stayed
5,am not lying
6,always uses
8,Are-playing
9,not to touch
10,Is-listening
11,Are-winning
12,am not staying
13,isn't working
14,isn't reading
15,isn't raining
16,am not listening
17,Are-making
18,Are-doing
19,Is-sitting
20,is-doing
21,do-putting
22,do-wear
23,is-studying
giúp mik vs ạ, mik cần gấp !!! cảm ơn nhiều ạ
Lời giải:
ĐKĐB $\Rightarrow \frac{2}{c}=\frac{a+b}{ab}\Rightarrow c(a+b)=2ab$
Khi đó:
$\frac{a}{b}-\frac{a-c}{c-b}=\frac{a(c-b)-b(a-c)}{b(c-b)}=\frac{ac-ab-ab+bc}{b(c-b)}=\frac{c(a+b)-2ab}{b(c-b)}=\frac{2ab-2ab}{b(c-b)}=0$
$\Rightarrow \frac{a}{b}=\frac{a-c}{c-b}$ (đpcm)
Giải gấp giúp mik vs ạ Mik cảm ơn trước ạ
1)
\(4Fe+3O_{2\left(dư\right)}\xrightarrow[]{t^o}2Fe_2O_3\)
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
\(FeCl_3+3KOH\rightarrow Fe\left(OH\right)_3\downarrow+3KCl\)
\(2Fe\left(OH\right)_3\xrightarrow[]{t^o}Fe_2O_3+3H_2O\)
\(Fe_2O_3+CO\xrightarrow[]{500-600^oC}2FeO+CO_2\)