A=269-(268+267+266+...+22+2+1)
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14 tháng 6 2021
Bài 1:
a) \(\dfrac{-17}{36}\) và \(\dfrac{23}{-48}\)
\(\dfrac{-17}{36}=\dfrac{-17.4}{36.4}=\dfrac{-68}{144}\)
\(\dfrac{23}{-48}=\dfrac{-23}{48}=\dfrac{-23.3}{144.3}=\dfrac{-69}{144}\)
Vì \(\dfrac{-68}{144}>\dfrac{-69}{144}\) nên \(\dfrac{-17}{36}>\dfrac{23}{-48}\)
b) \(\dfrac{-1}{3}\) và \(\dfrac{2}{5}\)
Vì \(\dfrac{-1}{3}\) là số âm mà \(\dfrac{2}{5}\) là số dương nên \(\dfrac{-1}{3}< \dfrac{2}{5}\)
c) \(\dfrac{2}{7}\) và \(\dfrac{5}{4}\)
Vì \(\dfrac{2}{7}< 1\) mà \(\dfrac{5}{4}>1\) nên \(\dfrac{2}{7}< \dfrac{5}{4}\)
d) \(\dfrac{267}{-268}\) và \(\dfrac{-1347}{1343}\)
\(\dfrac{267}{-268}=\dfrac{-267}{268}=\dfrac{-267.449}{268.449}=\dfrac{-119883}{120332}\)
\(\dfrac{-1347}{1343}=\dfrac{-1347.89}{1343.89}=\dfrac{-119883}{119527}\)
Vì \(\dfrac{-119883}{120332}>\dfrac{-119883}{119527}\) nên \(\dfrac{267}{-268}>\dfrac{-1347}{1343}\)
14 tháng 6 2021
Bài 2:
\(\dfrac{5}{2}-\left(1\dfrac{3}{7}-0,4\right)=\dfrac{5}{2}-\dfrac{10}{7}-\dfrac{2}{5}=\dfrac{47}{70}\)
15 tháng 8 2018
a) \(\frac{-1}{5}< 0\)
\(\frac{1}{1000}>0\)
=> -1/5 < 1/1000
b) 267/-268 = -267/268 < -1
-134/134 = -1
=> 267/-268< -134/134
Chúc bạn học giỏi
15 tháng 8 2018
a; -1/5<0;;1/1000>0
-1/5<1/1000
B,-134/134=-1
267/-268=-1+1/268
267/-268<-134/134
k cho mk nha
5 tháng 11 2018
266. They made her hand over her passport.
She ____WAS MADE TO HAND OVER HER PASSPORT___
267. I tried to eat that cake but it was too sweet.
It was __SUCH A SWEET CAKE THAT I COULDN'T EAT ____
268. My brother and I went to that school.
I went to ___THAT SCHOOL WITH MY BROTHER__
269. I often get up early in the morning.
I ___AM USED TO GETTING UP EARLY IN THE MORNING____
270. Getting a good job doesn’t interest him.
He __ISN'T INTERESTED IN GETTING A GOOD JOB____
271. The garden is too small to play football in.
The garden _ISN'T BIG ENOUGH TO PLAY FOOTBALL IN_
272. Be he rich or poor, she will marry him.
She will __MARRY HIM WHETHER HE IS RICH OR POOR__
273. We haven’t been to the movies for a year.
It’s ___A YEAR SINCE WE LAST WENT TO THE MOVIES____
274. John used to smoke.
John didn’t ___SMOKE ANYMORE___
H
5 tháng 11 2018
266. They made her hand over her passport.
She was made hand over her passport____________________________________________________________________
267. I tried to eat that cake but it was too sweet.
It was such sweet cake that i tried__________________________________________________________________
268. My brother and I went to that school.
I went to that school with my brother_______________________________________________________________
269. I often get up early in the morning.
I ______________________________________________________________________
270. Getting a good job doesn’t interest him.
He doesn't interest to get a good job____________________________________________________________________
271. The garden is too small to play football in.
The garden isn't big enough to play football in_____________________________________________________________
272. Be he rich or poor, she will marry him.
She will marry him ,if he is rich________________________________________________________________
273. We haven’t been to the movies for a year.
It’s a year since we have been to the movies____________________________________________________________________
274. John used to smoke.
John didn’t use to smoke_____________________________________________________________
24 tháng 7 2018
mk bt làm mỗi 1 câu thui thông cảm
B) 37 x 62 + 37 x 38
37 x ( 62+38)
37 x 100
3700
hok tốt
T
24 tháng 7 2018
a, 59 + 532 + 267 + 268 + 733
= 59 + ( 532 + 268 ) + ( 267 + 733 )
= 59 + 800 + 1000
= 859 + 1000
= 1859
b, 37 × 62 + 37 × 38
= 37 × ( 62 + 38 )
= 37 × 100
= 3 700
c, ( 1356 + 845 ) - ( 356 + 645 )
= 1356 + 845 - 356 - 645
= ( 1356 - 356 ) + ( 845 - 645 )
= 1000 + 200
= 1 200
30 tháng 8 2017
Câu a : \(-\dfrac{267}{268}\) và \(-\dfrac{1347}{1343}\)
Ta có :
\(-\dfrac{267}{268}>-1\)
\(-\dfrac{1347}{1343}< -1\)
\(\Rightarrow-\dfrac{267}{268}>-\dfrac{1347}{1343}\)
Câu b :
\(-\dfrac{13}{38}\) và \(-\dfrac{29}{88}\)
Quy đồng cùng mẫu số ròi so sánh tử
Đặt B = 2^68+2^67 +2^66+..+2^2+2+1
2B= 2^69 +2^68+2^67 +.......+2^3+2^2+2
→ B = 2^69-1
→ A = 2^69 - ( 2^69-1) = 2^69-2^69+1 = 1
Tick nha n!!!!
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