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3 tháng 12 2018

\((2^3\cdot3^2-5^4:5^2)+2017^0\)

\(=(8\cdot9-5^{4-2})+2017^0\)

\(=(8\cdot9-5^2)+2017^0\)

\(=(72-25)+2017^0\)

\(=47+2017^0\)

\(=47+1=48\)

Chúc bạn học tốt :>

2 tháng 12 2018

\(30+2x=4^{2017}:4^{2015}\)

\(\Rightarrow30+2x=4^2=16\)

\(\Rightarrow2x=16-30=-14\)

\(\Rightarrow x=-14:2=-7\)

2 tháng 12 2018

30 + 2x = 42017 : 42015

30 + 2x = 42

30 + 2x = 16

        2x = 16 - 30

        2x = -14

          x = - 7

18 tháng 6 2017

3(x-2)+4(5-x)=8

=> 3x - 6 + 20 - 4x =8

=>-x=-6  => x=6

28 tháng 2 2020

x^3 - 3x^2 + x + 5 = 0

=> x^3 + x^2 - 4x^2 - 4x + 5x +  5 = 0

=> x^2(x + 1) - 4x(x + 1) + 5(x + 1) = 0

=> (x^2 - 4x + 5)(x + 1) = 0

x^2 - 4x + 5 > 0

=> x + 1 = 0

=> x = -1

28 tháng 2 2020

mơn bn nha uyên

\(=\dfrac{33}{17}\cdot\dfrac{34}{3}\cdot\dfrac{2}{5}=\dfrac{2\cdot11\cdot2}{5}=\dfrac{44}{5}\)

11 tháng 5 2022

\(\dfrac{33}{17}\times\dfrac{34}{3}\times\dfrac{2}{5}=11\times2\times\dfrac{2}{5}=\dfrac{44}{5}\)

                 Giups mik vs mik cảm mơn trc ah~~1.ba can (fix)..............the lights.2. you(be)...........a famous author one day.3. you(have)......lots or friends soon.4.we..........(not go) camping next week.we............(visit) the museum.5. miss Thanh is ajournalist.she (not write)......for Lao Dong Newspaper.she(write)....for Nhan Dan Newspaper.6. i'd like...............(join) your club.7.why....you(make)..........so much  noise in your room,Lan?8. we(rehearse).......a play for the...
Đọc tiếp

                 Giups mik vs mik cảm mơn trc ah~~

1.ba can (fix)..............the lights.

2. you(be)...........a famous author one day.

3. you(have)......lots or friends soon.

4.we..........(not go) camping next week.we............(visit) the museum.

5. miss Thanh is ajournalist.she (not write)......for Lao Dong Newspaper.she(write)....for Nhan Dan Newspaper.

6. i'd like...............(join) your club.

7.why....you(make)..........so much  noise in your room,Lan?

8. we(rehearse).......a play for the school anniversary celebrations.

9. my sister (practice)......the violin in the club twice a week.

10. they(givE)........a farewell party next week.

11.what..........your father usually (do)......in the evening?

12. he usually(watch).......TV, but sometimes he (read).......books.

13. we(not go)........to the cinema very often. 

14.i (see)......a movie next saturday. .................you(go).................with me?

15. would you like(listen ) ........to music?

16. Mr. Thanh ...........(be) a doctor. He ..............(work)in a hospital in the city center. every day,he.........(catch)the bus to word.

 

 

 

 

 

 

1
11 tháng 9 2021

sao ko ai giúp zậyngaingungvuikhocroi

16 tháng 4 2019

NAm is the best

#Hk_tốt

#Ngọc's_Ken'z

16 tháng 4 2019

Mk sai r nhá nhầm lẫn xíu thông cảm

12 tháng 10 2021

\(\sqrt{x^2-2x+4}+\sqrt{x^2+5}=9-2x\left(đk:x\le\dfrac{9}{2}\right)\)

\(\Leftrightarrow x^2-2x+4+x^2+5+2\sqrt{\left(x^2-2x+4\right)\left(x^2+5\right)}=81-36x+4x^2\)

\(\Leftrightarrow2\sqrt{\left(x^2-2x+4\right)\left(x^2+5\right)}=2x^2-34x+72\)

\(\Leftrightarrow4\left(x^2-2x+4\right)\left(x^2+5\right)=4x^4+1156x^2+5184-136x^3+288x^2-4896x\)

\(\Leftrightarrow4x^4-8x^3+36x^2-40x+80=4x^4-136x^3+1444x^2-4896x+5184\)

\(\Leftrightarrow128x^3-1408x^2+4856x-5104=0\)

\(\Leftrightarrow128x^2\left(x-2\right)-1152x\left(x-2\right)+2552\left(x-2\right)=0\)

\(\Leftrightarrow\left(x-2\right)\left(128x^2-1152x+2552\right)=0\)

\(\Leftrightarrow x=2\left(tm\right)\)(do \(128x^2-1152x+2552>0\))

12 tháng 10 2021

cảm mơn bn ạ

29 tháng 5 2017

4/5 + 5/6 : 3/2

= 4/5 + 5/9

= 61/45

3/5 : 4/6 - 3/1

= 9/10 - .3

= -21/10

4/6 : 5/4 + 3/2

= 8/15 + 3/2

= 61/30

29 tháng 5 2017

\(\frac{4}{5}\)\(\frac{5}{6}\)\(\frac{3}{2}\)\(\frac{61}{45}\)

\(\frac{3}{5}\)\(\frac{4}{6}\)\(\frac{3}{1}\)= - \(\frac{21}{10}\)= -2,1

\(\frac{4}{6}\)\(\frac{5}{4}\)\(\frac{3}{2}\)\(\frac{61}{30}\)