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nhầm ạ 6x

a) \(A⋮B\Leftrightarrow n\ge2\)\(\left(n\in Z\right)\)

b) \(A⋮B\Leftrightarrow2n\ge2\Leftrightarrow n\ge1\)\(\left(n\in Z\right)\)

32,8 dm = 328 cm

Chúc bạn học tốt!!!

trả lời 

32,8dm=328cm

học tốt

tích cho mình nha

1)

Do tổng 4 góc trong 1 tứ giác = 360 độ (tính chất)

=> M + N + P + Q = 360 độ

=> 120 + 3P= 360

=> 3P = 240 độ

=> góc P = 80 độ

2) 

TTu áp dụng tổng 4 góc trong 1 tứ giác = 360 độ

=> D=360-40-60-120=140 độ

3) 

=> góc trong tại đỉnh A = 180-30=150 độ

Góc trong tại đỉnh B = 180 - 70 = 110 độ

Góc trong tại đỉnh C= 180 - 100=80 độ

=> Góc trong D = 360-150-110-80=20 độ

4) 

Do góc A=100 độ; góc B=120 độ

=> góc C + góc D = 360-100-120=140 độ

Mà góc C + góc D =20 độ

=> 2.góc C=160 độ

=> Góc C=80 độ

=> Góc D=80-20=60 độ.

đáp án :

30 phút

câu này là hỏi mấy giờ bạn ơ!

1.Our sources of energy will soon end if we don’t try to save them. 

=> Unless we try to save our sources of energy, they will soon end.

2. Barbare plays chess better than Mike.

=> Mike doesn’t play chess as well as Barbare.

3. Despite the silly story, many people enjoyed the film (although)

=> Although the story was silly, many people enjoyed the film.

4. Although the ket price was high, many people went to see that film. (However)

=> The ket price was high; however, many people went to see that film.

5. He performs very well, although he is young (Despite)

=> Despite being young, he performs very well.

6. It was a comedy, but I didn’t find it funny at all. (In spite of)

=> In spite of the fact that it was a comedy, I didn't find it funny at all.

7. The film was so boring. However, Jack saw it from beginning to end. (but)

=> The film was so boring but Jack saw it from beginning to end.

8.In spite of having a happy ending, the film begins with a terrible disaster.(although)

=> Although the film has a happy ending, it begins with a terrible disaster.

9. Although the film was a bit frightening, I really enjoyed it. (Despite)

=> Despite the fact that the film was a bit frightening, I really enjoyed it.

10. He is young, but he performs very well. (In spite of) 

=> In spite of being young, he performs very well.

2,35796km2=235,796km2.23579,6hm2.2357960dam2.235796000m2

69,805dm2=69,805dm2.6980,5cm2.698050mm2

Tính nhanh 

6,953×3,7+6,953×6,2+6,953×0,1

Bg

48 + x - 30 = 36 - 2x

48 - 30 + x = 36 - 2x

18 + x        = 36 - 2x

        x        = 36 - 2x - 18

        x        = 36 - 18 - 2x

        x        = 18 - 2x

        x - x   = 18 - 2x - x

        0        = 18 - 3x

        18      = 3x

        18 : 3 = x

         6       = x

Bài làm 

\(48+x-30=36-2x\)

\(\Leftrightarrow-18+3x=0\Leftrightarrow x=\frac{18}{3}=6\)

Bg

x³ - 3x - x(x² + 5x + 2) = 0

(x² - 3).x - x(x² + 5x + 2) = 0

x.[x² - 3 - (x² + 5x + 2)] = 0

=> x = 0 hoặc x² - 3 - (x² + 5x + 2) = 0

Xét x² - 3 - (x² + 5x + 2) = 0:

=> x² - 3 - x² - 5x - 2 = 0

=> x² - x² - (3 + 2) - 5x = 0

=> -5 - 5x = 0

=> 5x = -5

=> x = -5 : 5

=> x = -1

Vậy x = 0 hoặc x = -1

\(x^3-3x-x\left(x^2+5x+2\right)=0\)

\(\Leftrightarrow x^3-3x-x^3-5x^2-2x=0\)

\(\Leftrightarrow-5x-5x^2=0\)

\(\Leftrightarrow-5x\left(1+x\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}-5x=0\\1+x=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=0\\x=-1\end{cases}}}\)

\(P=1:\left(\frac{x+2}{\left(\sqrt{x}\right)^3-1}-\frac{\sqrt{x}+1}{x+\sqrt{x}+1}-\frac{\sqrt{x}+1}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}\right)\)

\(P'=\frac{x+2}{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}-\frac{\sqrt{x}+1}{x+\sqrt{x}+1}-\frac{1}{\sqrt{x}-1}\)    (​     \(P=\frac{1}{P'}\))

\(P'=\frac{x+2-\left(x-1\right)-x-\sqrt{x}-1}{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}\)

\(P'=\frac{-x-\sqrt{x}+2}{\left(\sqrt{x}-1\right) \left(x+\sqrt{x}+1\right)}=\frac{\left(1-\sqrt{x}\right)\left(\sqrt{x}+2\right)}{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}=-\frac{\sqrt{x}+2}{x+\sqrt{x}+1}\)

=> \(P=-\frac{x+\sqrt{x}+1}{\sqrt{x}+2}\)

Hermit ĐKXĐ đâu bạn eiii ??