1+4+9= ( ai nhanh minh moi tick dung nha)
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VT
1
T
15 tháng 5 2019
#)Giải :
Ta có : 1 = 0 + 1 ; 5 = 2 + 3 ; 9 = 4 + 5 ; ...
Do đó x = a + ( a + 1 ) ( a thuộc N* )
=> 1 + 5 + 9 + ... + x = 4950
= 1 + 2+3+4+5+6+...+ a + ( a + 1 ) = 4950
Hay\(\frac{\left[\left(a+1\right)+1\right]x\left(a+1\right)}{2}=4950\)
=> ( a + 1 )( a + 2 ) = 4950 x 2 = 9900
=> ( a + 1 )( a + 2 ) = 99 . 100
=> a = 98
Do đó x = a + ( a + 1 ) = 98 + ( 98 + 1 ) = 197
#~Will~be~Pens~#
QT
10
HT
7 tháng 5 2017
3-2 + 7 x 5-1 + 7 + 7 + 8 + 8 + 9
= 1 + 35 - 1 + 14 + 16 + 9
= 10 + 35 - 1 + 30
= 40 + 35 - 1 = 74
Chuẩn không dùng máy tính nhóe
RS
28 tháng 10 2017
Bài giải
Đổi : 9tạ 15 kg = 915 kg
6tạ 85kg= 685 kg
Trung bình mỗi vụ thu hoạch được số kg thóc là:
915 + 685 = 1600 ( kg )
Đổi : 1600kg = 16 tạ
Đáp số : 16 tạ
k mình nha!
LT
14
TT
2
21 tháng 8 2019
1/2+3/5+1/9+1/127+7/18+4/35+2/7
=(1/2+1/9)+(3/5+2/7)+1/127+7/18+4/35
=11/18+31/35+1/127+7/18+4/35
=(11/18+7/18)+(31/35+4/35)+1/127
=1+1+1/127
=2+1/127
=2\(\frac{1}{127}\)
=
26 tháng 6 2018
I was born on Hanoi where is the capital of Vietnam, and the country's largest city.
The city is located on the right bank of red river.
the old quarter, near Hoan Kiem lake has original street lay out and architecture of old Hanoi. At begining of the 20th century the city consisted of only about 36 streets. Each street then had merchants and households specialized in a parular trade such as silk, traders, jewelry, etc. The street names nowadays still reflect the specialization, although few of the remain exclusive in their original commerce. The area is famous for its small artisans and merchant, including many silk shops. local cuisine specialties, as well as several clubs, and bars can be found here also. a night market in the heart of the district opens for business every friday, saturday, and sunday evening with variety of clothing, souvenirs and food
ban dem xem du 300 tu chua
neu du thi k minh nha
26 tháng 6 2018
I was born on Hanoi where is the capital of Vietnam, and the country's largest city.
The city is located on the right bank of red river.
the old quarter, near Hoan Kiem lake has original street lay out and architecture of old Hanoi. At begining of the 20th century the city consisted of only about 36 streets. Each street then had merchants and households specialized in a parular trade such as silk, traders, jewelry, etc. The street names nowadays still reflect the specialization, although few of the remain exclusive in their original commerce. The area is famous for its small artisans and merchant, including many silk shops. local cuisine specialties, as well as several clubs, and bars can be found here also. a night market in the heart of the district opens for business every friday, saturday, and sunday evening with variety of clothing, souvenirs and food
ban dem xem du 300 tu chua
neu du roi thi k minh nha
chuc ban hoc tot
9 tháng 2 2016
Khi chuyển 1/4 số công nhân tổ 1 sang tổ 2 thì tổng số công nhân 2 tổ vẫn là 48 công nhân.Lúc đó,số công nhân tổ 1 bằng 3/4 ban đầu (= 1 - 1/4). Vậy 48 công nhân là 3/2 số công nhân tổ 1 ( = 3/4 + 3/4).Vậy số công nhân của : Tổ 1 là : 48 : 3/2 = 32(công nhân) ; Tổ 2 là : 48 - 32 = 16(công nhân)
14
1+4+9= 14