goi so do la abcd
khi viet them chu so 5 vao bn phai thi so do se gap 10 lan va 5 don vi
ta co :
abcd x 10 + 5 - abcd = 18113
18113 = abcd x 9 + 5
abcd x 9 = 18113 - 5
abcd x9 = 18108
abcd = 18108 : 9
abcd = 2012
tim so tu nhien co 4 chu so biet rang khi viet them chu so 7 vao ben phai so do thi duoc so co 5 chu so lon hon so phai tim11212 don vi
Cho 1 so co 2 chu so , neu viet them 15 vao ben phai so do thi duoc so moi hon so da cho 2094 don vi . tim so do ?
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tìm số tự nhiên co 4 chu so biet rang khi viet them chu so 7 vao ben phai so do ta duoc so co 5 chu so lon hon phai tim 11329 don vi
tim 1 so tu nhien biet neu viet them 1 chu so 0 vao tan cung ben phai so do ta duoc so moi hon so phai tim 2574 don vi
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Tim so tu nhien biet khi viet them chu so 5 vao ben phai ta duoc so moi hon so cu 2111 don vi .
