Khi chuyển dấu phẩy của số cần tìm sang bên trái 1 hàng, ta được số C
và số này kém số cần tìm 10 lần.
=> C = A/10
Khi chuyển dấu phẩy sang bên phải một hàng, ta được số B và số này lớn
hơn số cần tìm 10 lần.
=> B = 10A
Số B lớn hơn số C là 321,255 :
<=> B - C = 321,255
<=> 10A - A/10 = 321,255
<=> 99A/10 = 321,255
=> A = 32,45
Vậy số thập phân A là 32,45.

câu trả lời của Vũ Thị Hải Yến sai mà cũng được online math lựa chọn

 A = 28,64 chắc chắn 100%

HD: chuyển dấu phẩy sang trái 1 hàng thì A gấp B 10 lần

Chuyển dấu phẩy sang phải 1 lần thì C gấp B 10 lần

Vậy C gấp B 100 lần

Gọi B = 1 lần, C = 100 lần

Tìm B, ta lấy:

289,264 : (100 + 1) = 2,864

Suy ra A = 28,64

B=1/10A

C=10/1A

suy ra:b+c=289.264hay1/10a+10/1a=289.264

101/10a=289.264

a=289.264:101*10=28.64

trả lời nhanh giùm tớ nha

Ta thấy : B = A * 10 và C = A * 0,1

Mà B - C = 957,231 nên A * 10 - A * 0,1 = 957,231

=> A * 9,9 = 957,231

=> A = 96,69

Đ/s : 96,69

Coi A chiếm 10 phần => B chiếm 1 phần => C chiếm 100 phần 

Vậy tổng B + C chiếm :

  100 + 1 = 101 ( phần )

Giá trị 1 phần :

 289,264 : 101 = 2,864

A là :

 2,864 x 10 = 28,64

đ/s : ...

Nếu coi A chiếm 100 phần thì B chiếm 10 phần , C tương tự chiếm 1 phần 
Tổng của B và C sẽ chiếm :

  10 + 1 = 11 ( phần )

Giá trị 1 phần :

  289,264 : 11 = 26,2967....

Số thập phân A :

 26,2967... x 100 = 2629,67....

đ/s : ....

28.64 nhé

28,64 ủng hộ mk nha

a= 28,63

tich ủng hộ nha

Khi chuyển dấu phẩy của số cần tìm sang bên trái 1 hàng, ta được số C
và số này kém số cần tìm 10 lần.
=> C = A/10
Khi chuyển dấu phẩy sang bên phải một hàng, ta được số B và số này lớn
hơn số cần tìm 10 lần.
=> B = 10A
Số B lớn hơn số C là 321,255 :
<=> B - C = 321,255
<=> 10A - A/10 = 321,255
<=> 99A/10 = 321,255
=> A = 32,45
Vậy số thập phân A là 32,45.

Ta thấy trong 3 số thì số B là nhỏ nhất

B kém A 10 lần

B kém C 100 lần 

Tổng A+B+ C = 100 x B+ B + 10 x B = 111 x B = 221,778

B= 1,998 nên số A là 19,98

số C là: 199,8

100000000000000000/:

♤♤♤♤♤♡♡◇♡♡◇♧♧♡♡

éo hiểu 

19,89 CHÚC BẠN HỌC TỐT

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