mọi ng giúp e với
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
`B.I.`
`1.` a
`2.` c
`3.` d
`4.` a
`5.` D
`6.` C
`7.` B
`8.` A
`II.`
`1.` Shrine
`2.` impressed
`3.` traditional
`4.` for
`C.I.`
`1.` T
`2.` T
`3.` F
`4.` F
`II.`
`1.` Yes, Jeans the most popular kind of clothes almost everywhere, rich people and poor people wear them too.
`2.` Jeans the only kind of tradtional clothes in the United States.
`3.` Because everybody wants to be modern, young and independent.
`4.` (Tự trả lời)
`D.I.`
`1.` Many letters can be written to my pen pal in english by me.
`2.` has done
`3.` I wish today were a holiday.
`4.` I missed the bus, so I came to the meeting late.
1, \(x^2\) - \(x\) + \(\dfrac{1}{4}\) = 0
\(x^2\) - 2.\(x\).\(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) = 0
(\(x\) - \(\dfrac{1}{2}\))2 = 0
\(x\) - \(\dfrac{1}{2}\) =0
\(x\) = \(\dfrac{1}{2}\)
2, \(x^2\) - 10\(x\) = -25
\(x^2\) - 10\(x\) + 25 = 0
(\(x\) - 5)2 = 0
\(x\) - 5 =0
\(x\) = 5
e:
\(E=\left(\dfrac{\sqrt{15}-\sqrt{20}}{2-\sqrt{3}}+\dfrac{\sqrt{21}-\sqrt{7}}{1-\sqrt{3}}\right):\dfrac{1}{\sqrt{7}-\sqrt{5}}\)
\(=\left(-\dfrac{\sqrt{5}\left(2-\sqrt{3}\right)}{2-\sqrt{3}}-\dfrac{\sqrt{7}\left(1-\sqrt{3}\right)}{1-\sqrt{3}}\right)\cdot\dfrac{\sqrt{7}-\sqrt{5}}{1}\)
\(=-\left(\sqrt{7}+\sqrt{5}\right)\left(\sqrt{7}-\sqrt{5}\right)\)
=-2
f: \(F=\sqrt{3}+1+2-\sqrt{3}=3\)
a) phép tính đã cho bằng 24x2y3z2 : (-6x2y2z2) +(-12x3y2z3) : (-6x2y2z2) + 36x2y2z2 : (-6x2y2z2) = -4y+2xz-6. Thế x,y,z vào rồi tính nha
câu b khi nãy mình giải ở dưới rồi :)
Bài `1`
`a, (x+2)^2 =x^2 +4x+4`
`b, (x-5)^2=x^2 -10x+25`
`c,(2x-y)^2=(2x)^2- 2*2x*y+y^2=4x^2-4xy+y^2`
`d,(3x^2-2y)^2= (3x^2)^2 - 2*3x^2*2y +(2y)^2=9x^4-12x^2y +4y^2`
`e,,(2x-y)(4x^2+2xy+y^2)= (2x)^3-y^3=8x^3-y^3`
`f,(x+3)(x^2-3x+9)=x^3+3^3=x^3+27`