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Gọi số cần tìm là abcde
2abcde . 3 = abcde2
( 200000 + abcde ) . 3 = abcde . 10 + 2
600000 + abcde . 3 = abcde . 10 + 2
599998 = abcde . 7
abcde = 85714
tìm số có 5 chữ số,biết rằng nếu viết thêm chữ số 2 vào đằng sau số đó thì được số gấp 3 lần số có được bằng cách viết thêm chữ số 2 vào đằng trước số đó
gọi số cần tìm là abcde ,ta có
abcde2= 2abcde x 3 ,phân tích cấu tạo số ra ta dc:
100000a+10000b+1000c+100d+10e+2=600000+30000a+3000b+300c+30d+3e , rút gọn ta được :
70000a+ 7000b+700c+70d+7e+2=600000 nên 70000a+ 7000b+700c+70d+7e=599998
suy ra 7(10000a+1000b+100c+10d+e)=599998 nên 7abcde=599998
suy ra abcde=85714
Gọi số cần tìm là \(\overline{abcde}\)Theo đề bài ta có
\(\overline{7abcde}=4.\overline{abcde7}\Rightarrow700000+\overline{abcde}=40.\overline{abcde}+28\)
\(\Rightarrow39.\overline{abcde}=700000-28\Rightarrow\overline{abcde}=17948\)
Thôi kệ nhỡ làm rồi thì cho đẹp luôn :
Gọi số cần tìm là abcde (a,b,c,d,e là các chữ số ; a $\ne$≠ 0)
Ta có : 7abcde : 5 = abcde7
=> (abcde x 10 + 7) x 5 = 700000 + abcde
=> abcde x 50 + 35 = 700000 + abcde
Cùng bớt abcde ta được :
abcde x 49 + 35 = 700000
abcde x 49 = 699965
=> abcde = 14285
Số cần tìm là 14285
gọi số cần tìm là abcde (a;b;c;d;e là các chữ số ; a khác 0)
Viết thêm chữ số 7 vào trước số đó ta được số 7abcde
Viết thêm chữ số 7 vào sau số đó ta được số abcde7
Theo đề bài, 7abcde = 5 x abcde7
700000 + abcde = 5 x (abcde x 10 + 7)
700 000 + abcde = 50 x abcde + 35
700 000 = 49 x abcde + 35
700 000 - 35 = 49 x abcde
699 965 = 49 x abcde
abcde = 699 965 : 49 = 14 285
số cần tìm là 14 285
abc1 = 2abc x 3 abc x10 +1 = (2000 + abc)x3 abc x10 + 1 = 6000 + abc x 3 abc x 7 = 5999 abc = 857 axb=5.(0<a,b<=5) a=5xb. Nen b = 1( vi a <hoac = 5) vay a=5
Gọi 3 số là abc
theo đb ta có
abc1=3 x 2abc
abc x 10 +1 =3x 2000+3abc
7 abc= 5999
abc=857
vậy số đó là 857
857 dung 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