2, Tìm số A, biết chuyển dấu phảy của nó sang phải một hàng ta được B, sang trái một hàng ta được C và A+B+C=215,895
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1 tháng 4 2015
bạn vào câu hỏi tương tự sẽ có bài gần giống như vậy(bài 2)
VT
1 tháng 4 2015
ta có Ax10=B
A/10=C
Vay B - C = 10xA - A/10 = 957.231
100xA - Ạ = 9572.31
99xA = 9572.31
A = 9572.31/99
A = 96.69
theo đầu bài ta thấy số C là 1 phần , số A 10 phần , số B 100 phần, xong phần này là vẽ sơ đồ nhé
tổng số phần là 100 + 10 +1 = 111 ( phần )
số A là 215.895 : 111 x 10 = 19.45
đáp số 19.45
theo đầu bài ta suy luận C 1 phần , B 100 phần vì chuyển dấu phẩy sang phải của số A thì được số B , suy ra A 10 phần
Số A là = 215,895 : ( 100 + 10 + 1 ) = 19,45
Đáp số : 19m,45