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giá trị của chữ số 4 là: 4 000
Giá trị của chữ số 2 là: 20 000
Giá trị của chữ số 4 gấp giá trị chữ số 2 số lần là:
4 000 : 20 000 = \(\dfrac{1}{5}\) (lần)
Đáp số: \(\dfrac{1}{5}\) lần
Giá trị chữ số 6 trong lớp nghìn gấp giá trị chữ số 3 trong lớp đơn vị : 600000/30 = 20000 ( lần )
Gọi số cần tìm có dạng là \(\overline{abc}\)
Giá trị của chữ số hàng chục gấp 5 lần giá trị của chữ số hàng đơn vị nên 10b=5c
=>b=2c
Giá trị của chữ số hàng chục bằng 1/30 giá trị của chữ số hàng trăm nên ta có:
\(10\times b=\frac{1}{30}\times100\times a\)
=>\(10\times b=\frac{10}{3}\times a\)
=>\(b=\frac{a}{3}\)
=>a=3b
=>a=3x2xc=6xc
mà b=2xc
nên a=6; b=2; c=1
Vậy: Số cần tìm là 621
Từ trái sang phải giá trị của chữ số 7 là:
| Số | 38 735 | 67 021 | 79 518 | 302 671 | 715 519 |
| Giá trị của chữ số 7 | 700 | 7000 | 70 000 | 70 | 700 000 |
7 nghìn
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7000
Hoàng Thanh Thảo cậu làm gì vậy mà cứ .... hoài thế
gấp 70 lần bạn nhé