Tìm các số tự nhiên a và b biết tích của chúng là 4851 và ƯCLN của chúng là 21
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NH
1
26 tháng 12 2014
ƯCLN(a;b)=21 => a chia hết cho 21 => a=21k
ƯCLN(k;q)=1
b chia het cho 21 => b=21q
a.b=2426
=> 21k.21q=2426
=> 21.21.k.q=2426
=> 441.k.q=2426
=> k.q=2426:441 (ko chia het, ban xem lai de bai di)
8 tháng 12 2015
a) goi hai so la a ; b va a >b
vi UCLN(a,b)=18=>a=18k ; b=18q (trong do UCLN (k,q)=1 va k>q)
=>a+b=162
18k+18q =162
18(k+q)=162
k+q=9
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29 tháng 10 2016
21453
52542000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 | 542454550212.100000000000000000000000000000000000000000000000000000000000000000000000000000 |
ƯCLN(a;b)=21 => a chia hết cho 21 => a=21k
ƯCLN(k;q)=1
b chia het cho 21 => b=21q
a.b=4747 => 21k . 21q=4747
=> 21.21 .k.q=4747
=> 441.k.q =4747
=> k.q =4747:441 (ko chia het ban oi)