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20 tháng 3 2018
a) \(P\left(x\right)=2+5x^2-3x^3+4x^2-2x-x^3+6x^5\)
\(=6x^5-4x^3+9x^2-2x+2\)
b) \(P\left(1\right)=6\cdot1^5-4\cdot1^3+9\cdot1^2-2\cdot1+2\)
\(=6-4+9-2+2\)
\(=11\)
22 tháng 4 2017
dù bạn đăng nhầm nhưng mình vẫn trả lời nha !
a) f(x)- g(x)+h(x) = (x3-2x2+3x+1)-(x3+x-1)+(2x2-1)
f(x)- g(x)+h(x) = x3-2x2+3x+1- x3-x+1+2x2-1
f(x)- g(x)+h(x)= (x3-x3) +(2x2-2x2) +(3x-x)+(1+1-1)
f(x)- g(x)+h(x) = 0+0+2x+1
f(x)- g(x)+h(x) = 2x+1
b) Xét f(x)- g(x)+h(x)=0
Suy ra: 2x+1=0
2x= -1
x = - \(\dfrac{1}{2}\)
8 tháng 3 2017
1st syllable :August,present
2st syllable:Exports,imports,progress,decrease,protest,travelled,campaign,decide
@Huyền Anh Kute
LP
1
KN
21 tháng 10 2020
Ta có : 2x = 5y \(\Rightarrow\frac{x}{5}=\frac{y}{2}\Rightarrow\frac{x^2}{25}=\frac{y^2}{4}\)
Áp dụng t/c của dãy tỉ số bằng nhau, ta có :
\(\frac{x^2}{25}=\frac{y^2}{4}=\frac{x^2+y^2}{25+4}=\frac{133}{29}\)
Suy ra :
+) \(\frac{x^2}{25}=\frac{133}{29}\Leftrightarrow x^2=\frac{3325}{29}\Leftrightarrow x=\sqrt{\frac{3325}{29}}\approx10,7\)
+)\(\frac{y^2}{4}=\frac{133}{29}\Leftrightarrow y^2=\frac{532}{29}\Leftrightarrow y=\sqrt{\frac{532}{29}}\approx4,3\)
Vậy \(x\approx10,7;y\approx4,3\)
S
25 tháng 12 2016
2 More than £1,000 were raised for charity.
3 Loads of pictures were taken by the photographers
4 The show was put on the newspaper's front page.
5 All the clothes were designed by school children.
6 the whole evening was organised by the teenagers.
7 The music was written by a 16 year-old boy.
8 The lights were done by a 14 year-old girl
TD
25 tháng 12 2016
Rewrite the underlined sentences. Use the Past passive.
The school fashion show was a great success. 1 They invited 100 people and most of them came. 2 They raised more than £1,000 for charity. It really was a big event and there were even a few famous people there. 3 The photographers took loads of pictures and 4 the newspaper put the show on its front pages. The clothes were fantastic. 5 School children designed them all. It was amazing. In fact 6 the teenagers organized the whole evening. 7 A 16 year-old boy wrote the music and 8 a 14 year-old girl did the lights. It was wonderful to see what young people can do.
1 100 people were invited. (ex)
2 More than £1,000 was raised for charity.
3 Loads of pictures were taken by the photographers.
4 The show is putted on the newspaper’s front pages.
5 All the clothes were designed by school children.
6 The whole evening was organized by the teenagers
7 The music was written a 16 year-old boy
8 The lights was done by a 14 year-old girl.
LM
0
3 tháng 1 2017
2)viết công thức,cho vd so sánh(s2)(s2 hơn ,s2 bằng, s2danh từ, s2 nhất)
Answer: Comparative
| Short Adj: S + V + adj + er + than + Noun/ Pronoun |
| Long Adj: S + V + more + adj + than + Noun/ Pronoun |
Eg:
China is bigger than India (Trung Hoa to lớn hơn Ấn Độ)
Gold is more valuable than silver. (Vàng có giá trị hơn bạc)
Superlative
| Short adj: S + V + the + adj + est + Noun/ Pronoun |
| Long adj: S + V + the most + adj + Noun/ Pronoun |
Eg:
Russia is the biggest country.
(Nga là đất nước lớn nhất [trên thế giới])
Platium is the most valuable metal.
( Platium là kim loại có giá trị nhất [trong số các kim loại
Positive
S + tobe + as + adj/ adv + as + (S+tobe) + O
Eg:
Is the film as interesting as you expected? (Phim có hay như bạn mong đợi không?
She is not as charming as her mother was. (Cô ấy không duyên dáng như mẹ của mình
3 tháng 1 2017
Câu 1 ý bạn là phó từ tần suất ( trạng từ chỉ mức độ thường xuyên)??
LD
28 tháng 5 2017
Chuyển câu chủ động sang bị động :
1, The robber made everybody lie on the floor.
everybody was made to lie on the floor by the robber.
2, Don,t worry! Our teacher will help us study English grammar.
Don,t worry!we will be helped to study English grammar by Our teacher
3, Don,t let others see you.
don't let you be seen by others
4, They made us stay indoors while they were testing the new weapon.
we were made to stay indoors while the new weapon was being tested
5, He let me use his car for a week.
he let his car be used by me for a week
6, He has never let her look down on him.
she has never been allowed to look down on him
7, The teacher made him stay after the class because he hadn,t done his homework.
he was made to stay after the class by the teacher because his homework hadnt been done.
8, I will help you redecorate the room before Christmas comes.
you will be helped to redecorate the room before Christmas comes.
\(\left(\dfrac{1}{2}\right)^{100}:2^{-10}.2^5\\ =\left(\dfrac{1}{2}\right)^{100}.2^{10}.2^5\\ =\dfrac{1}{2^{100}}.2^{15}\\ =\dfrac{2^{15}}{2^{100}}\\ =\dfrac{1}{2^{85}}\)
\(Hello\) \(FDC\) \(nha!\)
=\(\left(\dfrac{1}{2}\right)^{100}:2^{-5}\)
= \(\left\{\left(\dfrac{1}{2}\right)^4\right\}^{50}.2^5\)
= 2\(^{50}.2^5\)
=2\(^{55}\)