#)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~#

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

3-2+7x5-1+7+7+8+8+9 = 74 

đáp án : 74

=74 nha

                                    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!

1600 nha ban

Cảm ơn bạn nha

chúc bạn một ngày vui vẻ

1 + 2 + 3 + 4 +5  +6 +7+8+9 = 45 nha k mình nha các bạn

45 bạn

1+2+3+4+5+6+7+8+9=45

0,07 và 88,78

0,63 : 9 = 0,07

355,12 : 4 = 88,78

/HT\

Thank you moi nguoi nhieu.

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\(\frac{1}{127}\)

=

Minh ngoc oi minh giu nguyen ket qua la hon so a

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

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

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)